Malicious PDF — malware analysis report

Static analysis result for SHA-256 856cc78299cb305c…

MALICIOUS

PDF

83.9 KB Created: 2021-03-15 00:24:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dcab173d3073fa4a52340f3daacda0b1 SHA-1: 564f1fb8eec29743493b99d01a49e3d4ea7d738a SHA-256: 856cc78299cb305ce884f872d24dda1d8a3da3f50d99c5643ab54c6dbc418d93
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links pointing to various PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The embedded URLs suggest a phishing or content distribution scheme.

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://leonvi.ru/wix?keyword=guide+to+troubled+birds PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366661/normal_6017db5fce492.pdfIn PDF document text
    • https://fomemifeju.weebly.com/uploads/1/3/4/7/134769467/kukofeko.pdfIn PDF document text
    • https://kuvinonufero.weebly.com/uploads/1/3/4/3/134307364/9267612.pdfIn PDF document text
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/gokebawuzozobit_laxamok_xelarevez_jefasare.pdfIn PDF document text
    • https://xidaxawefitorat.weebly.com/uploads/1/3/5/9/135958331/xupijutasebol_mutubo_kapoguge_fukepilonawud.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/hihfYia/rererokajikazitatuw.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/pjajdfs/megan_boone_blacklist_season_7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463554/normal_5fec381d41344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501214/normal_5fe5e3386bd08.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/Sgg1hgW/xonikalixajeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480382/normal_5fd031b3f11c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485172/normal_602ece9161b7b.pdfIn PDF document text
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/xaviniduxaduxa_tolaguloxugo_pifikol.pdfIn PDF document text
    • https://salapabozob.weebly.com/uploads/1/3/5/3/135326799/baxuxokediri.pdfIn PDF document text
    • https://cdn.sqhk.co/zepinima/jKq41B5/mejegokonejo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450036/normal_5ff41de83a22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388285/normal_5fda2c31d2397.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_off00010d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0B 4780 bytes
SHA-256: 2aac0deb58fe7f9d46874a2cd146692d9f50b44727324ec46828e4770545fe0f
font_01_sfnt_off00011d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D56 10928 bytes
SHA-256: f66a61c5d829190f0c12628bd89941b89051becf0dcd8108bcaa9a5f134b5f01

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