Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37978d70fc360ae…

MALICIOUS

PDF

95.0 KB Created: 2021-03-18 02:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1ff036fde57ee9838e3a82349a0e8851 SHA-1: b58bb282a0742dabda94a85f2449dfeb49308b80 SHA-256: f37978d70fc360ae28e6e1669d8ed5790a41b3bd8a5094ecc59ec70c520e2c28
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO poisoning tactic to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to the PDF's purported topic, likely to improve search engine ranking for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://pelibifir.ru/award?keyword=capacitors+in+parallel+and+series+pdf PDF link annotation
    • https://cdn.sqhk.co/nowavutu/bNu8mKa/rumosiripetixutibos.pdfIn PDF document text
    • http://passive-income.ru/epson_xp400_not_printing8lyw2.pdfIn PDF document text
    • http://xitnet.fun/79670250661536bq.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/fjagiha/maze_run_3d_labyrinth_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/jejdl7H/11983478133.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/ghhdvge/87241917705.pdfIn PDF document text
    • http://urolog.xyz/michael_talbot_holographic_universe_youtubeo1gt6.pdfIn PDF document text
    • https://kimewazokedusa.weebly.com/uploads/1/3/1/4/131454536/rebidikalutud_roxexirafuru.pdfIn PDF document text
    • https://cdn.sqhk.co/gosuzufus/icEgchi/eve_echoes_market.pdfIn PDF document text
    • https://sitavekoked.weebly.com/uploads/1/3/5/9/135974486/zedivesorisakazarek.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/uieLOgK/auto_photo_cut_paste_for_pc_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rapuwovire.rf.gd/nabibenovopenikomok.pdfIn PDF document text
    • http://kavotipuwevir.epizy.com/bastable_health_professional_as_educator.pdfIn PDF document text
    • http://biwodonugawodil.rf.gd/difference_between_autocad_lt_and_autocad_electrical.pdfIn PDF document text
    • http://mikugux.rf.gd/go_rin_no_sho_japanese_text.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_off000135fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 5052 bytes
SHA-256: a95167cd15643c1991e914c361d38e8ae1a2a38b8cc2f3d8bfd80d68d75766ea
font_01_sfnt_off00014732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14732 11672 bytes
SHA-256: 45d26f11b7c61ac5799750915254271882cdd95005cd6dca6ff9b0e7dd4310fd

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