Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f17b48d679f8184…

MALICIOUS

PDF

81.2 KB Created: 2021-02-25 12:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 17dd20bd4a6216a4f51e7a88c8c3b4e4 SHA-1: 90abc3a19a1b40f51c2f5dc1dd17315d62cd3651 SHA-256: 1f17b48d679f818455996862e7fc1d912787e3028cd2e4ed390929dadadbfb3f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to SEO-optimized PDF files hosted on various domains, many of which appear to be disposable. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs and the structure of the PDF suggest it's part of a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=lay+of+leithian PDF link annotation
    • https://cdn.sqhk.co/savujegu/ighinCV/puputifabisawug.pdfIn PDF document text
    • http://workmonster.net/fiwopinireromexaxhxitf.pdfIn PDF document text
    • https://wokawopirajer.weebly.com/uploads/1/3/3/9/133999547/ludol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_601ac70edc3b1.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/gcjchgA/11128136737.pdfIn PDF document text
    • https://manatelagaren.weebly.com/uploads/1/3/1/4/131437493/d43779.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/R2njeid/mumomum.pdfIn PDF document text
    • https://buxudirikebipur.weebly.com/uploads/1/3/1/1/131164004/rumalaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449968/normal_5fd24ff532ac2.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/bjjijPw/64435165447.pdfIn PDF document text
    • https://cdn.sqhk.co/tegatiwuwax/ibjfha6/1735825767.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_60066cab3a7c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385421/normal_5fcf618c0eae3.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/9422011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380682/normal_6022c2a396797.pdfIn PDF document text
    • http://geesecam.com/13307219993ko5nz.pdfIn PDF document text
    • http://muldwych.com/507479609055tpp9.pdfIn PDF document text
    • https://cdn.sqhk.co/bebubofawa/IrEegjk/22133516997.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/safenalavojuwu/fountas_and_pinnell_guided_reading.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_off0000f657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 4624 bytes
SHA-256: 5b54bcae775e8440988caad74f4e6b3b65658a543fb370075a99fd8c81527f13
font_01_sfnt_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 16024 bytes
SHA-256: 73b0c02a3a4f761016eaadb62fb60ca381923977e7b31d3ffbf183f394f927c9

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