Malicious PDF — malware analysis report

Static analysis result for SHA-256 5326cfa6192e3ca8…

MALICIOUS

PDF

103.4 KB Created: 2021-05-27 23:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d6f5ab29a0b687be09f52d44c056c9b4 SHA-1: 9fcb5a4d228eb7162f3dd76e0b581d3398a5f954 SHA-256: 5326cfa6192e3ca8c6a2b41c4fcae98a764a3f866b7f62a79e919857a8cb839c
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, identified as a link farm, with many pointing to disposable hosting services. The embedded URLs and the heuristic firings strongly suggest a malicious intent, likely for phishing or SEO spam. The ClamAV detection and ML classifier output further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=xiaomi+redmi+note+8+pro+global+version+android+10 PDF link annotation
    • https://didegesutozixu.weebly.com/uploads/1/3/2/6/132695701/pegosevilaj-lesuz.pdfIn PDF document text
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/sekumimaza.pdfIn PDF document text
    • https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/nizarexibuxe_soguwo_fatururaz_kofejabepo.pdfIn PDF document text
    • https://niwejipudid.weebly.com/uploads/1/3/5/3/135383293/318dbac.pdfIn PDF document text
    • https://bewejagaseti.weebly.com/uploads/1/3/4/7/134708857/5604945.pdfIn PDF document text
    • https://suziviwibemenaf.weebly.com/uploads/1/3/4/4/134485417/mobemuvotofike.pdfIn PDF document text
    • https://ridegagix.weebly.com/uploads/1/3/4/6/134668883/futokisolufofewaba.pdfIn PDF document text
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/a64f28fffac026.pdfIn PDF document text
    • https://tofeniva.weebly.com/uploads/1/3/4/6/134625175/39e0dbeffac.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/genarujat-bedabiv-mezuza-fujuxilidezu.pdfIn PDF document text
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/66d7f8b7d8f.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/difulojanevaju_zutepuwaju_manuzutadeso_voxoxuxasakabax.pdfIn PDF document text
    • https://xezolemi.weebly.com/uploads/1/3/5/3/135324657/zosufep.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/gepelefokis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/949b4db9-bb15-4e36-93cf-159a930e35b5/konowirejupatoxoxepub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5c2a39b-a701-4e7d-88c8-f3b24a40541a/how_to_write_multiple_quotes_in_a_sentence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7432527e-827c-4355-b0f9-b1642d93eed3/tibopelipirenepujafo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b35ac90-5f59-4a91-95e9-6c6fdaf21bef/blyss_dehumidifier_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165e694c-23b7-4a59-be02-3fc5184ef69e/93801267147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa67f40-d976-4ea1-8377-e3c178b59fab/bepes.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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB5 5260 bytes
SHA-256: a32a23eaeffa826cd539c1772f4807095b1bd9094223708ff5d83918fe231296
font_01_sfnt_off00010f3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3F 5844 bytes
SHA-256: 3d2f1e3c0e6a9761b3213453cddea871c82a785e2fdcc6cefbd776727a5c8ad2
font_02_sfnt_off00012307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12307 6148 bytes
SHA-256: 149738eb3e1d0bfb4a5732e89a115965e6f0cf3fc4971c694d3ce3619176544d
font_03_sfnt_off000132e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E6 24260 bytes
SHA-256: 1db431178a7201025dcbedc214abd40029dd2d33b56797814c369b7f4a1bbcfb
font_04_sfnt_off0001697c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1697C 16892 bytes
SHA-256: dc0727acc9e956602b45edb9b3f5cf57d33977b2a2088698dfb5e92aeaa9876f
font_05_sfnt_off000181a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181A4 3260 bytes
SHA-256: 7fdfd5dda46485a346a4b39c557ad47ddb03c445b1ecfbe3e3d829f8eb76545f

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