Malicious PDF — malware analysis report

Static analysis result for SHA-256 16132a245aef7551…

MALICIOUS

PDF

69.9 KB Created: 2021-06-13 03:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 74526a1eb4b2e38e2b950173729bfff6 SHA-1: a9a8905825bcbbc580218e444a1abd4f1b03eb1b SHA-256: 16132a245aef7551f25682f120a1755a9b9c7bc3309d81b9fff9de2ef0c9fc47
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs. The ClamAV detection and ML classifier further indicate malicious intent, likely for phishing or SEO manipulation. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf.

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://medvor.ru/pbw?utm_term=c+major+scale+5+positions PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482191/normal_5fed64184aefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412575/normal_602491888147e.pdfIn PDF document text
    • https://fubolilodizewe.weebly.com/uploads/1/3/5/3/135312413/4937778.pdfIn PDF document text
    • https://musazulawikale.weebly.com/uploads/1/3/5/3/135305526/2d5117025b6a.pdfIn PDF document text
    • https://rupugafes.weebly.com/uploads/1/3/4/8/134847604/muzikewisu.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/sebuzezifegon.pdfIn PDF document text
    • https://tajusubinem.weebly.com/uploads/1/3/4/8/134886452/72fe3d.pdfIn PDF document text
    • https://noxesole.weebly.com/uploads/1/3/4/6/134615833/kekidokisuziw-tokemele-siwomefafo.pdfIn PDF document text
    • https://mifeweravu.weebly.com/uploads/1/3/0/8/130874314/rezafane.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_605155e7a20cc.pdfIn PDF document text
    • https://kuviwavu.weebly.com/uploads/1/3/1/6/131606254/mufiwelojawopo.pdfIn PDF document text
    • https://bupulaserora.weebly.com/uploads/1/3/1/4/131437689/d8b6a.pdfIn PDF document text
    • https://banafazag.weebly.com/uploads/1/3/4/3/134325205/1547373.pdfIn PDF document text
    • https://vesalitekaso.weebly.com/uploads/1/3/4/3/134314643/6025711.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://morabef.pbworks.com/w/file/fetch/144746895/watch_drive_me_crazy_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a45d326-0ea7-4e56-866d-9ffc922f4463/subsonic_6.5_grendel_reloading_data.pdfIn PDF document text
    • http://zufogopojut.pbworks.com/f/93939849078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e6cc7b0-f554-476d-895d-f2ef31ee6df5/9836581852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2850302-f647-4f05-99bc-5022b7f0ff21/50278990831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e28e44f-e7c8-4959-b40a-8a0c1d20be44/active_and_passive_voice_exercise_for_class_8_icse.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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 5184 bytes
SHA-256: 5cac64e3bbbab92887466e1436d5f9a623bfcdc40a932c49caefeb5329cd45d1
font_01_sfnt_off0000e7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EB 10200 bytes
SHA-256: 322b485d26567f2778f9d591b5cc8bdbd74fbcfabdd98df566aa3be0cd1e9842

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