Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b369d5f9d73ec5d…

MALICIOUS

PDF

76.8 KB Created: 2021-03-17 13:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5aba1ed556c1f2f9b9f4277bdc482c50 SHA-1: ecd5826860181d7b74e8ead7eff7845799860d3b SHA-256: 5b369d5f9d73ec5d42ab67c706a5de774b2f2b58c7f91ec44c0f663bb42e12b3
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicative of a link farm or SEO scam. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious phishing or scam document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=pregnancy+category+drug+list+pdf+australia PDF link annotation
    • https://cdn.sqhk.co/mozozezowos/DvgfgYA/47417300613.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/gggijg1/animal_farm_book_quiz_answers.pdfIn PDF document text
    • https://xivanolub.weebly.com/uploads/1/3/1/3/131380121/8689485.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/zekigelis_zowubi.pdfIn PDF document text
    • http://povisowalikim.scienceontheweb.net/balanza_comercial_ecuador_2020.pdfIn PDF document text
    • https://geroguvipem.weebly.com/uploads/1/3/4/4/134465684/porokeb-sezefe-rafinu-bogixa.pdfIn PDF document text
    • https://cdn.sqhk.co/benadujeju/F9ijage/wordbrain_2_crime.pdfIn PDF document text
    • http://sabovibin.medianewsonline.com/33029044457.pdfIn PDF document text
    • http://zivepixafusav.22web.org/alliteration_assonance_and_consonance_worksheet.pdfIn PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/kenabe-bozemikupo-sirowodedul.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/e1YVUAT/60537192478.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_cf180a9966204487a99428366cdbd4c3.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_39e6f643f1134a4287aafd9fa87a7beb.pdf?index=trueIn PDF document text
    • http://wovotunuvovon.epizy.com/97971089544.pdfIn PDF document text
    • https://f730d15c-1921-46d2-b6d4-288333e40990.filesusr.com/ugd/e2c223_ce291d07102f4d548408a7d4fedf420b.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE234 5308 bytes
SHA-256: 9a336aabdaa4b6db6c4fc6111b6a9b37d77e8778a526c38dad5958b7b4f6733b
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 10404 bytes
SHA-256: 50cb0a9b98d49b5507d070e18ba6f3858814396f42d867410481a232ecc3a322
font_02_sfnt_off000117f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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