Malicious PDF — malware analysis report

Static analysis result for SHA-256 80dcffc1ffdf791a…

MALICIOUS

PDF

76.3 KB Created: 2021-03-24 21:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9d8be57f3f3be1cf83f49f40b30ea45 SHA-1: 6d06e8f122cea2c42a228d78ce4b16cf76890cc8 SHA-256: 80dcffc1ffdf791aee365e8a36b411a73c90e754f148d6bae3ec1d8840721ca4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting and link farms, suggesting an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links designed to appear legitimate but hosted on untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://ponafet.ru/award?keyword=advanced+life+support+in+obstetrics+also+pdf
    • https://vudegerolo.weebly.com/uploads/1/3/1/4/131452783/dae0a.pdf
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5fc877dd8dba1.pdf
    • https://cdn-cms.f-static.net/uploads/4464720/normal_6022e640b47a8.pdf
    • https://cdn.sqhk.co/pavetikedur/fjhhgg1/battleship_games_battleship_games.pdf
    • http://carbackseat.site/poultry_farm_biosecuritym86yp.pdf
    • http://menbp.online/tp-link_default_wifi_password_after_resetawxor.pdf
    • http://mini-cam2.club/8410244412wllzj.pdf
    • https://kaxorude.weebly.com/uploads/1/3/4/0/134095875/xevufogabosewavijo.pdf
    • https://cdn-cms.f-static.net/uploads/4467027/normal_603fed1b3908c.pdf
    • http://hackins.site/7822706687egiww.pdf
    • https://cdn.sqhk.co/jixuvepabu/fgjfjgB/eska_tip_top_lista.pdf
    • https://cdn.sqhk.co/pigevikuwi/hiid4YJ/hashtags_for_likes_instagram_2020_copy_and_paste.pdf
    • http://webcam-model.online/humminbird_depth_finders_for_sale8vyzt.pdf
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ff75d08c8428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_fb49f1501cc440d9a79deca0533b137e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a2111d32-bc93-440a-b96c-e1a504ca4ee2/happy_endings_season_3_episode_11_cast.pdf
    • https://e192e36c-395d-4660-9df6-aa7aed00c30a.filesusr.com/ugd/3aee12_d467c340cd0347a8badae79f5c72f0f6.pdf?index=true
    • https://2703069b-a6ff-4ff9-983c-db139a8d76ba.filesusr.com/ugd/8b61cf_1dca5ad1e8ad4bb78acb67758aa984ac.pdf?index=true
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_7bcd93ce471046d8ab61804736b4fec7.pdf?index=true
    • https://uploads.strikinglycdn.com/files/393ba88e-af08-4333-a7a4-396423c54ffc/ruwefimixusafebiguxonunu.pdf
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_ccbd03d31c7849b88a08a2336a684fd2.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ed.bin
543419e9a790d20bb9f8edb2b6b2de470ae3dd5d4e430f53a9f03e4328b82fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0ED 5220 bytes
font_01_sfnt_off0000f2b6.bin
43939f7b122e82c3bec93b9d5762ca8111fd9bb7281a9ed4d553590932b659e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B6 10764 bytes
font_02_sfnt_off000117ac.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117AC 4324 bytes

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