Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88cd9bc4b4e2a48…

MALICIOUS

PDF

109.3 KB Created: 2020-11-24 12:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 3bfb9a28bb68a993587081e63e151af8 SHA-1: eebfff8d1b15055141cc2cb393a4e1066d49903a SHA-256: b88cd9bc4b4e2a4842425898463b05414a9a081c7ec3bf437e3773dcbf7f7e7d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'trafffe.ru', which is flagged as a potential phishing or malware distribution site. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/strik?utm_term=introduction+to+geotechnical+engineering+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383295/normal_5f8d5b5b57178.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/6ebc6e.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/581402.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366306/normal_5f874b7f92a9d.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/mazedevuxidabiturixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_5fa90fbc14343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_5fba176753701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_5faa33f7e8cf7.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://s3.amazonaws.com/kijelopazekune/bad_genius_2017_english_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/27975670295.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/daily_oral_language_dol.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/heist_tights_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d2b6d0-ddff-462b-a68f-793eeb7379a4/complete_guide_to_fasting_jimmy_moore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180a2fd1-6a75-4ecb-8bde-18a8c18a3375/lasowolix.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB7 5060 bytes
SHA-256: 5b39dd4bcceca19f0d05ef082ec578a458393c25fb8c53a642f177611aba0a43
font_01_sfnt_off00015ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE1 11448 bytes
SHA-256: a30245a475aa7f0c94cf88f21fbcd69b11a54fb5acc75b5529dbfe28f1c71b92
font_02_sfnt_off00018432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18432 16036 bytes
SHA-256: bc1c1644e30597ae0beaac312b9749a82b64e26c109397326cdc67fdbaf2fe17
font_03_sfnt_off00019899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19899 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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