Malicious PDF — malware analysis report

Static analysis result for SHA-256 b856fe0281c51c0e…

MALICIOUS

PDF

72.5 KB Created: 2021-04-02 09:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dbecfe404d7739c9554d261dd7a20220 SHA-1: 14be063e5354d703c0a2823361f0a523c8d0dfcf SHA-256: b856fe0281c51c0e35baeaf3f19cde01b34e2cd52e72f1cbef8b587f914a4a02
186 Risk Score

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. 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 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://baarspo.ru/award?keyword=adding+and+subtracting+money+word+problem+worksheets+pdf PDF link annotation
    • http://romeita.space/back_to_life_hailee_steinfeld_ringtoneq934h.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/JK2iei6/momipa.pdfIn PDF document text
    • http://tomogorman.com/why_is_my_karcher_pressure_washer_leaking_oilmwnnz.pdfIn PDF document text
    • http://goproits.com/linapa9t3rw.pdfIn PDF document text
    • https://cdn.sqhk.co/xawowaguka/Xjgifhi/bhole_baba_all_dj_song.pdfIn PDF document text
    • http://vclean-sale.shop/ap_human_geography_terms_and_definition_of_hierarchical_diffusionxxcyb.pdfIn PDF document text
    • https://zopodiwozexuma.weebly.com/uploads/1/3/4/7/134737972/8470588.pdfIn PDF document text
    • http://naturalm.space/mififanibezkq6l0.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/gcbbziY/microwave_hard_boiled_egg_maker_instructions.pdfIn PDF document text
    • https://jutarufuro.weebly.com/uploads/1/3/0/7/130775772/tesojepodudefuwix.pdfIn PDF document text
    • http://bigwin-1xbet.fun/bts_airplane_pt_2_japanese_songx8wc6.pdfIn PDF document text
    • http://wisitens.online/abu_garcia_ambassadeur_5000djl0n8.pdfIn PDF document text
    • http://moreronofi.iblogger.org/14965557646.pdfIn PDF document text
    • http://soul-felt.com/skyrim_how_to_start8fv4z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_bc3c08eeedfd4498b7b4d7073698dd79.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_dfda998ec50c4796b36b2b0b5a04aa8b.pdf?index=trueIn PDF document text
    • https://1ee34b3e-bfcb-4e25-b227-79ffd44eef10.filesusr.com/ugd/9d5096_491166bcce4b4853a519449bb52c9757.pdf?index=trueIn PDF document text
    • http://vofabij.epizy.com/bopolugi.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_2ba172b07d6a484e82e5e1568cfa7719.pdf?index=trueIn 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5956 bytes
SHA-256: b313145c1f130e25e002e3008c0082d155037abf4e5002a5d244a359d7c9b25a
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 10860 bytes
SHA-256: 211f9858f32dbe9d1493794e988cc115b03a0518f1c5db0180b2f26ca6fcb326

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