Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c149406b28fe12e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-20 16:08:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 129b7ae1663e57e503fa0054849de75e SHA-1: 815d8f0e9ddeda96f179ee861d14a3f7ee17d801 SHA-256: 2c149406b28fe12efaa340cbcda44bb37854ec285b7eacb0a6647b21c7dcb0ac
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with a primary focus on a URL hosted on 'nipisod.ru', which is flagged as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/strik?utm_term=how+to+pair+soundbot+shower+speaker
    • https://cdn-cms.f-static.net/uploads/4368953/normal_6023d3d503010.pdf
    • http://doucheapp.xyz/what_level_are_we_in_californiamj9vo.pdf
    • http://podeves.xyz/46525750793n0lx.pdf
    • http://lezepubaj.iblogger.org/77499874717.pdf
    • http://podarokinsta365.site/why_is_my_impala_overheating29ca7.pdf
    • http://omerkatanalp.com/filmora_9_apk_download_pcoud7s.pdf
    • https://cdn-cms.f-static.net/uploads/4490377/normal_6019b9c28c02f.pdf
    • http://buybritishcat.com/ataide_e_alexandre_musicasoctlk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/af2f9f75-76af-464d-97bd-0b9e8c53c982/nixon_the_corporal_gold.pdf
    • https://uploads.strikinglycdn.com/files/a262568f-6f35-44e5-8190-31700fe511ce/what_does_restriction_b_mean_on_drivers_license_in_ohio.pdf
    • http://jimomug.rf.gd/how_do_i_change_my_fitbit_charge_4_to_24_hour_clock.pdf
    • https://uploads.strikinglycdn.com/files/8a1f3dde-ff03-4229-8df0-c5a3ee14905f/how_the_grinch_stole_christmas_cast_teacher.pdf
    • http://kafopazam.epizy.com/7042970457.pdf
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_28fb2a83ffe54f5daabe493c6a6e2090.pdf?index=true
    • https://s3.amazonaws.com/pafexegud/3867344379.pdf
    • https://s3.amazonaws.com/fomaralunex/profit_and_loss_template_printable.pdf
    • http://nixevafuzija.epizy.com/teaching_approach_definition.pdf
    • http://webekilijonelew.epizy.com/monkey_wrench_answers.pdf
    • https://uploads.strikinglycdn.com/files/f835c0f0-af6b-4142-81b3-4191d420b4a7/how_does_bitcoin.work.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_12882466f49e457abd7b425a9a87b176.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://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_off0000df92.bin
d049a0fcb2e413824044c450df83a6701ade346fbe1dbb67948b68b92d57fc41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF92 5272 bytes
font_01_sfnt_off0000f179.bin
6d3c2abc3e4a171250c7f8237068bf6cd212a7eb43b250c2f20a9d25013ded01		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF179 11200 bytes

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