Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d2851ab0187959…

MALICIOUS

PDF

58.4 KB Created: 2021-01-12 11:31:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e26648d7cf8ae04f2bd3c2cad37eff78 SHA-1: 1ef701c9a7cdc45679b776b60f9abd290d4ebcfb SHA-256: 42d2851ab01879594c7c1e1281a8dbcbf9c2e9938784c311708999e228a12bbe
124 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 high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. No scripts were extracted, but the presence of many external links suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8144

Heuristics 4

  • 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 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
  • 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://trafftec.ru/aws?utm_term=terapps+tecnologia+informatica+sas
    • https://cdn-cms.f-static.net/uploads/4483867/normal_5fd192f7ada72.pdf
    • https://cdn-cms.f-static.net/uploads/4384851/normal_5f99015f7b1b9.pdf
    • https://cdn.sqhk.co/mogidamiko/ihLiagc/kuxozesapitoni.pdf
    • https://cdn.sqhk.co/gotakavapu/hggiWhg/zeds_dead_logo_png.pdf
    • https://site-1175626.mozfiles.com/files/1175626/mini_golf_club_near_me.pdf
    • https://cdn.sqhk.co/nupegefozub/4Bkhhjd/3d_pool_ball_free_coins.pdf
    • https://static.s123-cdn-static.com/uploads/4446016/normal_5fe1c0dff3396.pdf
    • https://site-1177443.mozfiles.com/files/1177443/stickman_battle_fight_mod_apk_android_1.pdf
    • https://cdn-cms.f-static.net/uploads/4375077/normal_5f8960e82226e.pdf
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/torudumiguma.pdf
    • https://site-1177476.mozfiles.com/files/1177476/download_game_idle_air_force_base_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xukanomarexumu/generative_sheetmetal_design_catia_tutorial.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc8e.bin
52ff5a69087953c170d2d4964a47a0ec39c9062619fd386ec5e62e29bb193186		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8E 5284 bytes

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