Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e985944b1fcea8…

MALICIOUS

PDF

72.6 KB Created: 2021-06-06 03:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 64cd880058b6e8a7ae788e167f562853 SHA-1: d67dff1cdcdffe063dd78b82a322ec8f8401c71c SHA-256: c2e985944b1fcea8722bc9f16dec9825bc814db4b5fc9b05e19d99d6f02a62da
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting or link farms, indicating a malicious intent to redirect users. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://infrive.ru/pbw?utm_term=free+diabetic+meal+planner+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467036/normal_60baf2c0995a1.pdfIn PDF document text
    • https://pupisisewovafon.weebly.com/uploads/1/3/4/5/134500239/402e42bcae1273.pdfIn PDF document text
    • https://befapoge.weebly.com/uploads/1/3/1/6/131637854/6702059.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5fe49f6146386.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_5fe948da42826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451575/normal_6029d1508a28a.pdfIn PDF document text
    • https://suziviwibemenaf.weebly.com/uploads/1/3/4/4/134485417/xalilisodibixolajipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_6014551ccb174.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_60582c3b5f3b7.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4406191/normal_60afff028251e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378382/normal_605965fa39d71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417221/normal_5fcbad779891b.pdfIn PDF document text
    • https://mebusogaduvorit.weebly.com/uploads/1/3/0/9/130969439/2312447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_60256e7f25d67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rasovuxosew.pbworks.com/f/tomopino.pdfIn PDF document text
    • http://junerew.pbworks.com/w/file/fetch/144683373/steel_construction_manual_15th_edition_used.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/144458616/vibolegitazabo.pdfIn PDF document text
    • http://sovamexor.pbworks.com/f/39128269448.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/f/a_concise_introduction_to_logic_6.4_answers.pdfIn PDF document text
    • http://davixezudi.pbworks.com/w/file/fetch/144659703/99468386406.pdfIn PDF document text
    • http://supijexed.pbworks.com/f/jibulifukoloja.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/f/72307724167.pdfIn PDF document text
    • http://felefejimax.pbworks.com/w/file/fetch/144512655/bobesijenuvododejuzuzowev.pdfIn PDF document text
    • http://liwuvedesisu.pbworks.com/f/fuzujolukizo.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/54310524791.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_off0000e166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 5136 bytes
SHA-256: 8f711fc16260fcd8617120aaf97ca8864856846247e7d57967bd1bfc2d87c047
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 9864 bytes
SHA-256: 0e725b1ba08622ed93879a7744739f2edb484187463c8768ebc308252ce360b0