Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b11c090a1eeddb…

MALICIOUS

PDF

76.6 KB Created: 2021-03-26 15:28:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 295b6b2e0e815944f329fd64d8a4b9ab SHA-1: 8f5b08cae1d7268d573be7075bd4b02e389d6c80 SHA-256: c4b11c090a1eeddb7fe71f0cb01373a8b46e566fb7898ad5e9562204690f92b0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/123?utm_term=online+audio+converter+er PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407781/normal_605ddde60f4f9.pdfIn PDF document text
    • http://trokot-roznica.xyz/dipazumd5i.pdfIn PDF document text
    • http://citimart.online/how_to_fight_sanscsprx.pdfIn PDF document text
    • http://ca-manalapan.space/west_bend_bread_maker_41073_user_manuallhurr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465125/normal_60388cf6a06bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384628/normal_600685ff881ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5fcf9619ed78c.pdfIn PDF document text
    • http://help-igcopyright.xyz/13594515551nxy2w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373986/normal_5fee762685c44.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413570/normal_5ffb6181404a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_025d03d62883402b923c857910c5116a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/51597605947.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/52808747370.pdfIn PDF document text
    • https://8459f3b7-b2e6-4b58-af31-5f29adf293b7.filesusr.com/ugd/a68450_1932e594de294cf0a88033f78a4406f8.pdf?index=trueIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_fdf423c8580143f18d267fe2ecb20516.pdf?index=trueIn PDF document text
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_6c4910339d0a4ad883263079adec5a76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d54377b2-9471-4734-b543-129c4212e5fd/stand_by_me_ben_e_king_song_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98adb2d-33bc-44e6-9aef-691104efc88d/the_guilty_one_book_club_questions.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_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 4844 bytes
SHA-256: a0b9d9c1aeef6e1bcca091b1d669840e07614de3715239c5933bfc9e456679ab
font_01_sfnt_off00010073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10073 10900 bytes
SHA-256: 4a81c87fe83c73f14838b7aab92b81a7e2b0ab6f453a55c5e320d8532b60a0a8

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