Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ece14eda3c8fa9e…

MALICIOUS

PDF

96.2 KB Created: 2021-06-09 14:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 0bb3d8e87d217c1091b7dcfba5ab18c1 SHA-1: 2f08091b61679c40058922997e3aead4d5c7894e SHA-256: 4ece14eda3c8fa9ed2da31ddb044a53d0b7b206fd8dc1cf4fb695d6e0bd98c30
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9997

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pistant.ru/pbw?utm_term=oliver+twist+book+review+pdf PDF link annotation
    • https://xipakopubax.weebly.com/uploads/1/3/5/9/135966228/528744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475716/normal_602f006eb6e78.pdfIn PDF document text
    • https://mesakejaj.weebly.com/uploads/1/3/4/7/134754162/kibijusabeka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459467/normal_5fee04d198b14.pdfIn PDF document text
    • https://zaxifugerabapaz.weebly.com/uploads/1/3/1/0/131071175/funiwivasijorivefot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_605ff803d4c1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_604f3824c7ed5.pdfIn PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/5111820.pdfIn PDF document text
    • https://zusamazoboxo.weebly.com/uploads/1/3/4/5/134527389/sonemufi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetibubib.pbworks.com/f/rereg.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427944/solving_exponential_equations_worksheet_with_answers.pdfIn PDF document text
    • http://wexagiz.pbworks.com/f/resident_evil_george_romero_script.pdfIn PDF document text
    • http://juzifezazuk.pbworks.com/w/file/fetch/144923295/wenuwavufiwakufuvavoluder.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/telewebopagaboxikoloti.pdfIn PDF document text
    • http://kuperuxowix.pbworks.com/f/mikro_muhasebe_program_indir_gezginler.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144524358/29719395088.pdfIn PDF document text
    • http://xofitesu.pbworks.com/w/file/fetch/144447936/dutoveki.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144415545/2158749847.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_off00013d5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5A 5208 bytes
SHA-256: 7cac6c81669a855af88029ccc1d678228f4308720bfce11b2ac0eab0157e3d9e
font_01_sfnt_off00014f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F35 11096 bytes
SHA-256: af406620f2af5e3e0c957ef8a472364a186f56a0a10e122ce49ebce49947fcf9

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