Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aea345cec567910…

MALICIOUS

PDF

76.9 KB Created: 2021-03-31 15:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: bcf39f1dc19d336f624f82c99b05bd0b SHA-1: 53359ee7ffa63b4a785c5c744469ae7e6391704a SHA-256: 4aea345cec567910932bfc941c094a85bd998fd36cbd16357dabd1c57b26ed4f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=berserker+pure+quest+guide+osrs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376854/normal_5fc5997b3b6d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485576/normal_605fbcf9aadf8.pdfIn PDF document text
    • http://zuvoxikoxeseko.22web.org/tarikh_pembayaran_gaji_2020.pdfIn PDF document text
    • http://faketikus.22web.org/vorabewiwuxomoduxaxe.pdfIn PDF document text
    • https://katalajoguv.weebly.com/uploads/1/3/2/7/132740778/3294243.pdfIn PDF document text
    • https://womukowewefe.weebly.com/uploads/1/3/4/8/134889771/1119790.pdfIn PDF document text
    • https://cdn.sqhk.co/kutagigixef/Xihiaij/enable_flash_player_google_chrome_android.pdfIn PDF document text
    • https://cdn.sqhk.co/muribirigim/3jajegc/bumipitopetuje.pdfIn PDF document text
    • http://zomirowolozutu.iblogger.org/chicco_cortina_cx_travel_system_red.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382961/normal_604334916f5e1.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/igHVujh/97638103747.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/ihB6Iii/jungle_run_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fcc6093634b1.pdfIn PDF document text
    • https://vozozexofevufut.weebly.com/uploads/1/3/1/8/131871902/f2f7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d01007-3480-4cbd-91c8-ec1c50c38b81/vuzovukimuwovuru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b7c20b-63bf-4049-8049-6d4419e440d4/lajukusadozuzeziretisabow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1506904d-ae36-42dd-bc50-9faec44d88b5/al_quran_digital_online_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b8a1e92-84d6-49c5-a350-61bcc1078c55/what_are_pituitary_gland_disorders.pdfIn PDF document text
    • http://dexixikix.epizy.com/nusekasajixixixegoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24b71a9a-bee5-42db-9bcb-f9320ebbe75c/pidapujajivopevupi.pdfIn PDF document text
    • http://gixarab.rf.gd/93912991456.pdfIn PDF document text
    • https://www.youtube.com/bidoofed��In 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
    • https://www.youtube.com/bidoofed��)SkillsIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD795 5124 bytes
SHA-256: 5b8f72badbbb8acd843896e7c547e2546bec7a331e0c86f6b4e35da976fa0139
font_01_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 11168 bytes
SHA-256: c58ee06c1d365c1bbf5894fe1344c79ff37f33b95f8553f63d389b930a4326db
font_02_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501