Malicious PDF — malware analysis report

Static analysis result for SHA-256 8955c37989eb9fcc…

MALICIOUS

PDF

81.5 KB Created: 2021-03-10 05:03:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80ec693830da90c0110c7cfb3be6f9d4 SHA-1: e149b0904255ebb1288a7f808a8098e4f6c12b1c SHA-256: 8955c37989eb9fccf2ed78ddfb783e953210288870313e64db3e056c2efc05cc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The embedded URL and the heuristic firings indicate that this PDF is designed to redirect users to malicious websites, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=pertaining+to+discharge+of+sebum+medical+term
    • http://bufezipuduxev.mywebcommunity.org/20750162762.pdf
    • https://cdn.sqhk.co/gadukupuwe/djbNiey/36748307072.pdf
    • https://cdn.sqhk.co/loberutebe/dhgLjaA/16055195153.pdf
    • https://cdn.sqhk.co/radojiga/1dUhdjj/guided_meditation_mindfulness_of_breathing.pdf
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/nopovetex.pdf
    • https://cdn.sqhk.co/vivepovugeli/ia87hhz/82822725041.pdf
    • http://zipubezexupoka.mywebcommunity.org/mosawimorewezimekeselulo.pdf
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/1cc9cdb4.pdf
    • https://cdn.sqhk.co/jabosuve/ii4Qoeh/capcom_home_arcade_eb_games.pdf
    • https://bobefadapuxat.weebly.com/uploads/1/3/4/8/134858353/9453178.pdf
    • https://molefagis.weebly.com/uploads/1/3/5/3/135311004/vibusajewovalov.pdf
    • http://swiss-gear.shop/52505274735cj9rn.pdf
    • https://cdn.sqhk.co/xuxovunevo/CXhawon/alien_isolation_mission_5_keycard.pdf
    • http://gedirobidepud.scienceontheweb.net/rogazixonuvu.pdf
    • https://cdn.sqhk.co/xefilelo/hgjav3R/25188307329.pdf
    • https://cdn.sqhk.co/rerunaropiz/cjjIXY3/sefopolavideme.pdf
    • http://seplafond.xyz/12978220570p4waq.pdf
    • http://instas.site/beast_quest_game_free_online_playk3rb5.pdf
    • https://cdn.sqhk.co/pesamelez/E9sAEjb/dibeposajisorum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wimidisa.epizy.com/44607562883.pdf
    • http://buwijakuwomem.rf.gd/bloons_tower_defence_4_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_off0000faa3.bin
ebe760d833a36fdf446301ae6d05538194a28073435e9362bb702b8c3f43261e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 5576 bytes
font_01_sfnt_off00010d6f.bin
f20bb9acbf63f40f64dde1cbbce670d817531885b336820aa6f41b28e9dceda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6F 13464 bytes

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