Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba92a21dba513c6…

MALICIOUS

PDF

76.2 KB Created: 2021-03-17 18:55:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 774e357f13c66bfd0f5ca39de23037fb SHA-1: e4180df4e4c2c89b3d528d612b7d85735302a88d SHA-256: 2ba92a21dba513c61f66b475e31672bdaac00f4b292d21ca5978680817f676f7
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a lure for a product search term. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The PDF structure and embedded URIs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

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://bologen.ru/strik?utm_term=mercruiser+4.3+oil+filter+sierra PDF link annotation
    • http://itravelimpressions.com/245170938769lsn0.pdfIn PDF document text
    • http://mgacessoria.online/lilo_and_stitch_colouring_sheetsmftns.pdfIn PDF document text
    • https://cdn.sqhk.co/vefasebo/gicolji/calm_down_angry_neighbor_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefaxeker/8wCie32/george_s_barber_shop_brooklyn_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/jesuzedavoti/hjdgiiZ/tezuramikovamej.pdfIn PDF document text
    • http://ririzobe.medianewsonline.com/sipiguwatilavasebibix.pdfIn PDF document text
    • http://xaraxag.mypressonline.com/luzedimixoworaxujegog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_71a44c783b3a4cfbbfd27fbf78bc2549.pdf?index=trueIn PDF document text
    • https://4ceac43d-3374-4736-8926-b47930641487.filesusr.com/ugd/3b1191_3edada3fb9594e3ca6e91149ac549da8.pdf?index=trueIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_1bc4bae883e1478686c698dd9fd773b6.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_c2977cf2e8204f96908eef3dd0a66123.pdf?index=trueIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_f7e33f0a376541c3aedafc3d11a8716f.pdf?index=trueIn PDF document text
    • https://ff9dba89-6132-4485-99c2-ace8a2453124.filesusr.com/ugd/c3f59f_efe60f34e6b942f79db73bc1836fbefa.pdf?index=trueIn PDF document text
    • https://1cdd1dcb-54a5-4750-95ad-c4cce9a68cd1.filesusr.com/ugd/1e32c2_1167a52bceeb48159f96313c3e77acb3.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_cb4550cac4884d11bdd48611832675ec.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_b91e8b4a4bfa453fbed5f2c5c01816bc.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 5164 bytes
SHA-256: 4194f7d1de4a76d463ac6115872d41e85da438f872a9161eabe4566e8190723d
font_01_sfnt_off0000fe01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE01 11124 bytes
SHA-256: b5b838de4e769969825906ce20ff3a6e3dd508dc400a9596c95b55512bb5cd0c

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