Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd30898b4632d284…

MALICIOUS

PDF

81.3 KB Created: 2020-11-17 20:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 312ac055cfa82f9596e19ff6e8efd165 SHA-1: 6fc9f3496aa67cc48e57de66704f800239874c4a SHA-256: bd30898b4632d28419977bd0ef3a06b731a4f1c6df60ed0c7bb09b930657f731
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One prominent URL, 'https://trafficel.ru/strik?utm_term=estructura+de+la+treonina', is flagged as suspicious. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to direct users to malicious content.

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://trafficel.ru/strik?utm_term=estructura+de+la+treonina
    • https://cdn-cms.f-static.net/uploads/4413843/normal_5fa8a898d9446.pdf
    • https://cdn-cms.f-static.net/uploads/4380887/normal_5f99239a501ba.pdf
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/fenebawobadekaberi.pdf
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5f9c54c8abe24.pdf
    • https://cdn-cms.f-static.net/uploads/4402280/normal_5f9973b66bff2.pdf
    • https://cdn-cms.f-static.net/uploads/4413838/normal_5f98fef5a3660.pdf
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/fcfbbcf37d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muvarelo/fuposibibabe.pdf
    • https://uploads.strikinglycdn.com/files/859982a5-725e-4d7d-8b89-806890b63e82/my_maths_3c_homework_book_answers.pdf
    • https://uploads.strikinglycdn.com/files/52f62b36-307f-4c1d-bf66-8d11e487acb7/dexozebew.pdf
    • https://s3.amazonaws.com/xapota/77137034317.pdf
    • https://uploads.strikinglycdn.com/files/a3485fcb-ed7a-406c-a258-0ba27fe2b893/81085287987.pdf
    • https://s3.amazonaws.com/gifiz/michael_boyle_functional_training_for_sports.pdf
    • https://s3.amazonaws.com/gewuwasi/farmall_h_manual.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8ff.bin
79391f89415011766c53c1391fd920817127df14be1bab23f308dea3a49ce33a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FF 4892 bytes
font_01_sfnt_off0000f9ae.bin
8a6deaf52470dccafcb957d5e9da2b232ac889a258abe32a1e24c59f297da266		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 12124 bytes
font_02_sfnt_off00012168.bin
d25a34a56be33791b66bd7dbe91ee772b39b89bee75ba0e64ef3ea6cb2c10b57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12168 16260 bytes

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