Malicious PDF — malware analysis report

Static analysis result for SHA-256 4db27a733cbe77bc…

MALICIOUS

PDF

75.5 KB Created: 2021-04-06 03:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c142f0256e1c50a7f2442b1bdfcf7eb1 SHA-1: edc4a6fe94c15bbc786e51e008c470a9ffd95b9d SHA-256: 4db27a733cbe77bc17b232538fca68c003ed5593cce0ade3e04abe66af7cc8b3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or SEO poisoning attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the primary function is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://botokaw.ru/award?keyword=carrier+inverter+error+code+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420438/normal_602c8d32e35fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384035/normal_600492f9a765c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376866/normal_5ffb2ec156274.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446377/normal_5fcc20276606b.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/Ijeg0jb/mozekev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387816/normal_6055a12fef3ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379038/normal_6049e9d66e2ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460241/normal_5fe99f7c1c703.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/giSytom/dodgers_astros_score_last_night.pdfIn PDF document text
    • https://muxetomanudone.weebly.com/uploads/1/3/1/4/131406273/kazudifokel_mamewifitu.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iWigias/zigujetogakajabivizepixot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_60239fc56fcd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_6029026f6e249.pdfIn PDF document text
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/6161715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456376/normal_6059ef7dea950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409627/normal_602afa95bde3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411489/normal_5ff7fbac45f06.pdfIn PDF document text
    • https://cdn.sqhk.co/sogefuluf/9M1icgf/xizekunotum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385004/normal_60069c98d2c62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5fced1f563fee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_6007043f3aa63.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 4904 bytes
SHA-256: 99d563aabaa2621949eed3d06ed272b2f350a109e7ea416854fe06247e35cdc8
font_01_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 10292 bytes
SHA-256: 9d943104e428a3f68814358bb5c71317e12ec68ec2acec589174fd5ab3b9da22

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