Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b3724d6b7552dc…

MALICIOUS

PDF

141.4 KB Created: 2021-05-31 23:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 550b9ccf77e4cbb87d5ec5ab5bc44b7f SHA-1: 5fd44621b593548d49cf826165bda5a71e28430d SHA-256: 26b3724d6b7552dc7464f2e71dbef1223cce1ba08fa370d42ded450bf2fb747c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8742

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://krisoc.ru/pbw?utm_term=d%2526d+pirate+ship+map PDF link annotation
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/b50d0d.pdfIn PDF document text
    • https://ganogajegukak.weebly.com/uploads/1/3/3/9/133999764/1d871cd.pdfIn PDF document text
    • https://pudexaxetodeli.weebly.com/uploads/1/3/2/6/132683251/muzatiseruduri.pdfIn PDF document text
    • https://nagorulanol.weebly.com/uploads/1/3/4/4/134465391/821a11d7699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_602a597c02929.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427086/normal_60149b4f1e8a0.pdfIn PDF document text
    • https://zobatovegu.weebly.com/uploads/1/3/0/8/130873738/sanone-pubijojux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443602/normal_60527cbf81e59.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/bobupoxitiwobek_madusubawirugik_wosevemuma_jiranigitol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://tagexoba.pbworks.com/f/38536935039.pdfIn PDF document text
    • http://pevozowo.pbworks.com/w/file/fetch/144424260/34855601878.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec1ad56c-0b72-49e2-90cc-36923b26f07f/1452385298.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/f/kamyab_jawan_program_sme_form_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18338d7-85cd-46b5-82db-48e83fca3427/how_long_to_study_for_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60650ddb-b3b9-4570-97e1-4c18fc4de5ca/60433461807.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/14908003733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9b47f33-a283-49dc-80cd-fca0a6b43e3e/banimevokozil.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/86341846942.pdfIn PDF document text
    • http://sewafebi.pbworks.com/w/file/fetch/144426363/xobasabobiwukodetaluwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84fd15f5-909c-48a2-8ac4-24808b977bf7/99662971629.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144424284/spider_man_web_of_shadows_psp_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://www.gnu.org/licenses/lgpl.htmlRegularDanhHongIn PDF document text
    • http://www.geocities.com/dnhhngIn PDF document text
    • http://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    +1 more URL(s)

Extracted artifacts 17

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_016_off0001e2ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1E2EE 19460 bytes
SHA-256: d26319f497c6d76a077782ecab9c09e7a19149491fb23be27b34914fa24fece6
font_00_sfnt_off0000f2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FB 7916 bytes
SHA-256: e679725072c74ab1de830ba6dd25101ec2f6d7be962e72d99a133184e56e62d0
font_01_sfnt_off0001075b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075B 6484 bytes
SHA-256: c83fd9d1b431f7b9dc5f903d49d0aecfddc282b3a5950cb10d6ab18e6e767f35
font_02_sfnt_off00011dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBF 4156 bytes
SHA-256: 58eabb24298f18ab3cb5c3f3a5652a185830994b36fd37cd9ad46fcf77495092
font_03_sfnt_off00012bea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BEA 2656 bytes
SHA-256: c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde
font_04_sfnt_off000136ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EE 4140 bytes
SHA-256: fbdd9df555c8710fa493947bde41d1b30e4b750f457ece442df516a7dd53c510
font_05_sfnt_off0001440a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 3048 bytes
SHA-256: 4bb619f7e4c8d10c6650d66271e6db770d7def95493d885be3efe54e7c100c22
font_06_sfnt_off00015012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15012 4544 bytes
SHA-256: 8de763cc392d555d6555ce28e49a7801ce7361977d5c0c1f0cca23967a7df2d1
font_07_sfnt_off00015e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1C 2328 bytes
SHA-256: 3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f
font_08_sfnt_off000168da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DA 2604 bytes
SHA-256: 7f3a1ef136f36ba68bc36e5bcd31de243dce7f4b60e01c4bc40f508baeb48ca0
font_09_sfnt_off000173fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FD 2108 bytes
SHA-256: e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97
font_10_sfnt_off00017d9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D9D 3840 bytes
SHA-256: cca5298ad2e89ab0d41cc63a8205340d9321530172a8d5dda1c28d17fa56adaa
font_11_sfnt_off00018bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BB5 4336 bytes
SHA-256: 87016e8933cc862d1d188edfbee698abcff8178ed3d6b510b61737ee02f60284
font_12_sfnt_off00019955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19955 6148 bytes
SHA-256: 4910d0177da9f60ecc92c13a34fae8c5c38ffafb9e4e22a3c3fd987548b79157
font_13_sfnt_off0001a940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A940 20376 bytes
SHA-256: 940a27991eaa69f388677ed81ff384ef9c7b16956b2956433ddfcae75c3ed7f4
font_15_sfnt_off000204be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204BE 3612 bytes
SHA-256: e6a127d4807db9283a7accf384a78a2b0e3b5516854c6cc3c0883f933369f6f8
font_16_sfnt_off000212dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212DD 4216 bytes
SHA-256: f2ee77ef46d574326e15e5d832115933ac9a59561f08735e614fb36f91e87993

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