Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f39f901a5641ea…

MALICIOUS

PDF

85.0 KB Created: 2021-02-12 16:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7377bd265a86477497d3419ca2c25b74 SHA-1: 66b926b4c81737478cc7ebf2e829fbb6698b75f3 SHA-256: c8f39f901a5641ead81afe660b05174feeb5cdbec84d0276a3da031a180c5338
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to search engine optimization, further supporting the lure mechanism.

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://seumenha.ru/wb?keyword=adform%20lithuania%20uab%20rekvizitai PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5feef1c43ed7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485434/normal_60177e1d38521.pdfIn PDF document text
    • http://ipoteka.net/temporally_ordered_routing_algorithm0vjv1.pdfIn PDF document text
    • http://getsalle.xyz/escmid_guidelines_pneumoniar15xf.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/BiedhaE/gakeduwapexebawajodoni.pdfIn PDF document text
    • https://cdn.sqhk.co/dopuwene/gbhihgV/megan_fox_and_machine_gun_kelly_age_gap.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/euDjdnK/kunajivopoxo.pdfIn PDF document text
    • http://wordsideget.top/puvalujiqepu0.pdfIn PDF document text
    • http://storeeu.info/space_racers_season_1hp32b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413563/normal_60020fca34674.pdfIn PDF document text
    • http://muldwych.com/best_whatsapp_profile_picjotdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_6018711666444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449998/normal_60053b3473c53.pdfIn PDF document text
    • http://pressit.space/13265657349b6ep3.pdfIn PDF document text
    • http://reactivaperu-2020.com/6tiwl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5fd81fa2b3da9.pdfIn PDF document text
    • http://idealslimitaly.site/bolekedokazanitotacuqu8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://labapok.rf.gd/commas_worksheet_grade_4.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 5272 bytes
SHA-256: 86d554882a32e262b0b830918106e228638f2f3ad87372e4d3d00237c30a2859
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 14360 bytes
SHA-256: c7a6e4495738a719e5e73571417753d800502358c36434714a3f8d87b29e96b1
font_02_sfnt_off0001297a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297A 18096 bytes
SHA-256: e54001e1766bab9466e78d403dd742e7498bc880c9fab7bc1f4b936b79bf172e

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