Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ee9244702e99dd…

MALICIOUS

PDF

71.9 KB Created: 2021-01-25 09:32:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f515e8bb339482343ce16ee46f626df SHA-1: 7743f3eb6d2a3120b1fecec85fde8c43401ce7d8 SHA-256: e8ee9244702e99dd71ad8128cfad5ef55e47a6579ae647e078b4f97b6846d4a0
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is part of a link farm on disposable hosting, a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://traffnew.ru/aws?utm_term=acls+bradycardia+algorithm+2018+pdf
    • https://cdn.sqhk.co/gabazumad/fKvijjz/space_invaders_tv_plug_and_play_arcade_game.pdf
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fefee2fb2825.pdf
    • http://want-seo.ru/10_band_equalizer_app_downloadvek15.pdf
    • https://cdn.sqhk.co/xipepovivik/dRs1C7A/african_animals_coloring_pages.pdf
    • https://cdn.sqhk.co/rarirawibowo/coGggic/matchington_mansion_hack.pdf
    • https://static.s123-cdn-static.com/uploads/4379034/normal_5fef783c62d2b.pdf
    • https://static.s123-cdn-static.com/uploads/4476294/normal_5ff2d7047d539.pdf
    • https://cdn.sqhk.co/runetonorox/aIQtQ7W/damn_delicious_blueberry_pancakes.pdf
    • http://kraftmann.su/523512423663vvel.pdf
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fe82c617e251.pdf
    • https://static.s123-cdn-static.com/uploads/4489237/normal_600591a235366.pdf
    • https://cdn.sqhk.co/wunokebewoz/VHaaCIX/wbtw_tv_13_florence_south_carolina.pdf
    • http://xsale.trade/8158457724hko9l.pdf
    • http://feedbacrnz.space/98716704878rkl53.pdf
    • https://cdn.sqhk.co/teganipuputu/gdtExCE/turbocharger_vacuum_line_diagram.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kigavanus/baidu_wifi_hotspot_for_windows.pdf
    • https://s3.amazonaws.com/podawakumepewez/addicted_movie_soundtrack_free.pdf
    • 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_off0000d968.bin
e841e66bed5964ab0757da4a9eb0e5a0311bde98cda75b4fb6027450fd553bde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 6320 bytes
font_01_sfnt_off0000eec9.bin
98723644b5e7162a204aa6ea15f170a7942175d2dda336654c32b2ab2c4e4976		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC9 10556 bytes

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