Malicious PDF — malware analysis report

Static analysis result for SHA-256 971101c186f02da8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-22 02:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42880aa8311e4d3c77822dd6c55a3784 SHA-1: 98006b47a58d57766c742b388cb67d3411f459ed SHA-256: 971101c186f02da8ce1119d909e1ebce164b75d8fbb36c7807fb572c6c47b41d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is used to host numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=english+printable+worksheets+for+grade+7
    • https://cdn-cms.f-static.net/uploads/4393180/normal_602e379021919.pdf
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/basotetewakeno.pdf
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/godufewurofof.pdf
    • https://static.s123-cdn-static.com/uploads/4417024/normal_5fe272a8bd4ee.pdf
    • https://zufikuwokuz.weebly.com/uploads/1/3/4/5/134522796/7590260.pdf
    • https://cdn.sqhk.co/bafujifi/Cy82Ugh/woporixumevutukupajubop.pdf
    • https://static.s123-cdn-static.com/uploads/4484812/normal_6004bb4f83110.pdf
    • https://cdn-cms.f-static.net/uploads/4475571/normal_602520c25eddd.pdf
    • https://cdn-cms.f-static.net/uploads/4424935/normal_60152e640d01c.pdf
    • https://cdn-cms.f-static.net/uploads/4484815/normal_602f9937f3089.pdf
    • https://cdn.sqhk.co/nifodotiriru/giEgjih/war_of_the_gods_billy_paul_lyrics.pdf
    • https://zudiwimuda.weebly.com/uploads/1/3/1/4/131438079/b7f3ec.pdf
    • https://cdn.sqhk.co/favosejo/ASBwmgj/stickers_maker_para_whatsapp.pdf
    • https://dipakinujudisil.weebly.com/uploads/1/3/4/4/134468351/penirasu_womarurixineva_dobokegubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b7536656-09a3-4638-8440-89776961855e/polygon_games_for_grade_2.pdf
    • https://uploads.strikinglycdn.com/files/8c45a6ea-5e38-422d-9280-05696c8bfb0a/93911018047.pdf
    • https://uploads.strikinglycdn.com/files/c35248e0-e887-4764-aea5-94361e8af71e/goditodigobafelixopekagij.pdf
    • https://uploads.strikinglycdn.com/files/0d2dc604-4dff-4d02-8e78-6c9b24df12ee/mibaxurafixonave.pdf
    • https://uploads.strikinglycdn.com/files/cc549049-f77e-48a6-b5b7-858653bf7346/zazujefanaxo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed62.bin
b6a0d8c0911570c828a658807fbd914bd7834998e9aea1fed31ba17e761d03de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED62 5636 bytes
font_01_sfnt_off0001009f.bin
046ead3d66c3f9934bd091bcd2073aa6c2ab00a83c83a5c480babd9101f931d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009F 10784 bytes

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