Malicious PDF — malware analysis report

Static analysis result for SHA-256 3885af4746c6dff6…

MALICIOUS

PDF

77.8 KB Created: 2021-03-16 13:52:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e10fba9b811dc772565c55c8d09e00aa SHA-1: 9f34c39e6a2f40ceb8c9bb8a6ef6695ec62516c0 SHA-256: 3885af4746c6dff6247fe2cae2cedb3dc3491479363728c38293980313af2289
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • 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.
  • 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 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://dafemum.ru/123?utm_term=digital+transformation+ppt+template+free
    • http://healsmall.space/barbershop_2002_parents_guideo0kk7.pdf
    • https://gevupowola.weebly.com/uploads/1/3/1/4/131483584/miwezi.pdf
    • https://cdn-cms.f-static.net/uploads/4445889/normal_60101fe233858.pdf
    • https://cdn.sqhk.co/vekokoze/39jcOvD/drift_max_pro_cheat_money.pdf
    • https://static.s123-cdn-static.com/uploads/4404757/normal_5fe544fe3d3e7.pdf
    • http://afracheat7.xyz/colour_picker_tool_windowsulsfn.pdf
    • https://cdn-cms.f-static.net/uploads/4376125/normal_602fb19bab9a9.pdf
    • https://zivozisexime.weebly.com/uploads/1/3/2/8/132814465/a0be35c9f5.pdf
    • https://cdn-cms.f-static.net/uploads/4476127/normal_601e770f8882a.pdf
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/d193f.pdf
    • https://cdn.sqhk.co/lolajelor/zgiicjf/nigerian_highlife_music.pdf
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/3033523.pdf
    • http://introdom.ru/ninja_parkour_vector_323zhg.pdf
    • https://static.s123-cdn-static.com/uploads/4468836/normal_5fdf92b1c66cb.pdf
    • https://cdn.sqhk.co/nemalerute/gjjehfs/rezoro.pdf
    • https://pegugigatusib.weebly.com/uploads/1/3/4/4/134460290/jibiro.pdf
    • https://cdn.sqhk.co/wukorovev/Ktmjhii/toxicology_report_results.pdf
    • https://cdn.sqhk.co/linewebozid/ihdjgfN/fruit_master_game_download_play_store.pdf
    • http://mif-smeh.space/how_much_does_medical_laboratory_technologist_makem6oz7.pdf
    • http://indital.fun/britax_marathon_convertible_car_seat_height_limit40voa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_a012a253c5eb4d07b8964b805ca2ebae.pdf?index=true
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_d6ccda9c202d48aeb4ae3ae38e53a7af.pdf?index=true
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_2316b484d0db4a9a9d6577faa72a6f13.pdf?index=true
    • https://0879403c-3be5-48e4-925f-21334a7d5cfe.filesusr.com/ugd/407fcc_c0f463bf29024cd29392da0cc10ec267.pdf?index=true
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_97f79d2326ba489fa087a165523ed1af.pdf?index=true
    • https://29aa9d28-cc9d-45fc-8d86-3718b5881c84.filesusr.com/ugd/74c34a_837467d5891d459da2255a3b6ab2f8f5.pdf?index=true
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_da85beee07dd4bd3968dcadb07ca7a26.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f266.bin
3a3b48f4cc802b6dc312dad2032d4691b0e8299ba738bd4aff36809fce80751a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 5220 bytes
font_01_sfnt_off00010422.bin
dcca217edb83223fb34e113884f2d9c8e6f743c14e4c2abfc2352615e8af630c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10422 10752 bytes