Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8a9f869be921a5…

MALICIOUS

PDF

94.2 KB Created: 2021-01-09 10:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7cfbb3dfd683b61669c6961798c22a73 SHA-1: b682dda1127e974ce1e2fc2426d47018d9da0989 SHA-256: cf8a9f869be921a5abc86467b88505b67d027eec96fef4c1605442770fc1b7c9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, directing users to various domains. The primary URL, https://traffnew.ru/123?utm_term=common+trees+word+whizzle+answers, suggests a lure for potentially malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=common+trees+word+whizzle+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371269/normal_5f9610e44c82e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_5fd99e31371d9.pdfIn PDF document text
    • https://cdn.sqhk.co/kupibetefuko/D3ge5bT/38819027391.pdfIn PDF document text
    • https://cdn.sqhk.co/wemegofuk/fjjiejd/43944616761.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafuzivega/ajhaLhb/jisakirogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495846/normal_5fc52768a5057.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ijfPAjc/44758608653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fbe191a0ee4e.pdfIn PDF document text
    • https://cdn.sqhk.co/zixemoliz/ihifAxQ/sokipatodoluwazoden.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461207/normal_5fb9f80a29018.pdfIn PDF document text
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/fogobabijejus.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/2271e036-01dc-4c63-ba9a-5ce9d9eb2bd2/58415557892.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95b664a2-2f41-4131-9d35-e737fb968e12/mezulun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6044eb-399d-458a-a93e-45541a7fb8b6/17412811818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f2a50ea-eb56-435d-9513-86e0d9704581/burlington_coupons_2017_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4e629d-2461-4b37-9038-4c66cf9d4c08/molipazojoputogibuxa.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_off00013772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13772 5112 bytes
SHA-256: e72c0af5f8386b5d5d8e2b95f8ec1a90e369572170a585756c161e3b9ba500f9
font_01_sfnt_off000148b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B9 10424 bytes
SHA-256: 751fab3b027e325b63b2af36121e2a4b6cf9eedcc9025b771ac54c5e011f2b62

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