Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8f0f9695382cdf…

MALICIOUS

PDF

83.8 KB Created: 2021-04-06 04:45:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df2109c705b81758e0a8b196cdc965e0 SHA-1: 8753d4636fe66f6c8fcb2be8237eeead95fa0b48 SHA-256: 8b8f0f9695382cdfd8aa2c34d4d3166a455799496c71f1a917e2cea4022f109a
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by heuristics as a link farm and a potential phishing lure, disguised as a Casio G-Shock watch manual. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks. No scripts were extracted, but the presence of external links suggests the document's primary purpose is to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/123?utm_term=casio+g+shock+watch+manual+pdf
    • https://komomofuxuz.weebly.com/uploads/1/3/4/4/134494735/nukirokaze.pdf
    • https://gigazubexu.weebly.com/uploads/1/3/4/6/134613152/9736833.pdf
    • http://geparup.scienceontheweb.net/70593154537.pdf
    • http://zujadise.scienceontheweb.net/how_to_read_literature_like_a_professor_chapter_20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zusunikumejimet.rf.gd/93435706804.pdf
    • http://dupetomumipur.rf.gd/bandos_solo_guide.pdf
    • http://radiviwix.onlinewebshop.net/bokesapexogaputozekaranu.pdf
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_65cc32d519de4c48ae52d56b931edefa.pdf?index=true
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_9210fc8c966e4aec979344af5ed7aec9.pdf?index=true
    • http://wuviwalot.rf.gd/burial_rites_hannah_kent.pdf
    • http://wuboxobotuz.rf.gd/47813860560.pdf
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_46d6e3f009df40459892f0931ddf1e01.pdf?index=true
    • http://darefobimig.epizy.com/maze_runner_free_download.pdf
    • http://xafibejijopo.atwebpages.com/spanish_grammar_rules.pdf
    • http://feriwodopumumo.rf.gd/17741538034.pdf
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_ecf69950ee68427e87dd9d9b607347d8.pdf?index=true
    • http://nuwumunis.epizy.com/40808266864.pdf
    • https://68f2566a-c586-4d15-a5d1-3a72044c38f3.filesusr.com/ugd/ecec20_bc3461619eab4d4c9d67fb02feefdaea.pdf?index=true
    • http://nakimot.epizy.com/automate_programmable_industriel_dunod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa35.bin
acd3e98fc74e5fbf442320e0c91c234aa4ed867c6980612d0e0418997a743ba9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 5416 bytes
font_01_sfnt_off00010c92.bin
afd721ea2e31362db5b9643a61669aee4479fbdea6fb0850e55f0aef4fceb1aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C92 11160 bytes
font_02_sfnt_off0001324b.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1324B 4324 bytes

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