Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1731ee04184bc60…

MALICIOUS

PDF

80.8 KB Created: 2021-03-09 21:08:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 108fd748bf05a48c94f9430d9b9435b0 SHA-1: 274bba25d9feefbaf82108b6f63b33cc1895bcd2 SHA-256: a1731ee04184bc6043dc5aaa13be848b473c6aad76bcba0fc7f99c05321638e8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a phishing or malware distribution campaign.

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://jumiwimov.ru/award?keyword=bose+soundlink+revolve+user+manual+pdf PDF link annotation
    • https://bivojivowuru.weebly.com/uploads/1/3/4/7/134726538/bef890d64aa7dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_603e80f3ac8f1.pdfIn PDF document text
    • http://mon-cmso.best/stretch_band_exercise_routine26tlu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418970/normal_60279278a427e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480895/normal_60062f8f7d396.pdfIn PDF document text
    • https://zuwogirunuwexi.weebly.com/uploads/1/3/5/3/135331524/58635817a3d929b.pdfIn PDF document text
    • http://maxist.ru/mexapm2dc4.pdfIn PDF document text
    • http://megatorg.ru/life_operating_meaningqt03v.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://migibujefixofap.rf.gd/brahmananda_swarupa_audio.pdfIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_357ab00641a14a8d95a8430c09c05cc9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a50aba5-5267-42eb-b206-1975ea9ca391/71989276891.pdfIn PDF document text
    • http://juvudujaxajiji.epizy.com/pulopuwoxemogudamimurub.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_d7fe60682b0d4bbaa144a13eed5914e4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/27875f10-41f6-4d30-9f04-3575396d3013/vuvagimi.pdfIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_2c77f702ed6240c6b0df479ea0ad5261.pdf?index=trueIn PDF document text
    • http://potilokimesuve.rf.gd/where_is_the_air_filter_on_my_kenmore_refrigerator.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 5360 bytes
SHA-256: 12f5698c143fcc979740fc1d2c08bce44a6102146b1570c4293b3c662b51aeb5
font_01_sfnt_off000110c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C8 10784 bytes
SHA-256: 76f1fcbe630c2b7194bb8d3063ce38ace1d604672a7e4870269de131f2a4cf41

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