Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e10b4221a5205e…

MALICIOUS

PDF

77.0 KB Created: 2021-03-30 22:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9067fee0ce4751a6ae0e015d628a7db3 SHA-1: d0787d9bb432d8e238ca13f7009f843b64591ec7 SHA-256: a6e10b4221a5205e6a2bf07a2c9e89a933b5c8588ceaafcd043de21ebc386c76
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured to appear as search results for specific documents, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=blanchard+macroeconomics+5th+pdf
    • https://levazisibeguni.weebly.com/uploads/1/3/1/0/131070530/liroluxid.pdf
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/8960657.pdf
    • https://cdn.sqhk.co/verexoleki/ibVifhg/29237214752.pdf
    • http://tesekal.mygamesonline.org/molecular_biology_and_evolution_journal_abbreviation.pdf
    • http://rosativiwam.mypressonline.com/bnf_65_free_download.pdf
    • https://cdn.sqhk.co/terasovo/4hghjjd/gajelimuzofusujal.pdf
    • https://cdn.sqhk.co/kulobibab/ev6W5eH/bojuwemirumutumerigararoz.pdf
    • https://cdn-cms.f-static.net/uploads/4464078/normal_5fe9e9e6d403b.pdf
    • https://cdn-cms.f-static.net/uploads/4475000/normal_6016643527e96.pdf
    • https://cdn.sqhk.co/zidulibu/Y8KhcZ9/download_drake_n_trap_mod_apk.pdf
    • https://static.s123-cdn-static.com/uploads/4470688/normal_5ff1c6f16a7e0.pdf
    • https://cdn.sqhk.co/soxesemu/PQAH0ja/ferrari_driving_experience_los_angeles.pdf
    • https://cdn-cms.f-static.net/uploads/4415754/normal_605ef7a55007e.pdf
    • http://mevixonur.mywebcommunity.org/6350190667.pdf
    • https://cdn-cms.f-static.net/uploads/4417992/normal_6052b60482840.pdf
    • https://wotigutaz.weebly.com/uploads/1/3/4/3/134361511/ponubura.pdf
    • https://cdn.sqhk.co/wozovege/4Ci5hdc/jovase.pdf
    • https://cdn.sqhk.co/fovomesit/hUXKGih/whip_widget_sound_effect_big_bang_theory.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8680f761-e5b3-4816-9a4f-ee11f2158a88/nulefa.pdf
    • https://uploads.strikinglycdn.com/files/9d61cbf6-d0f9-4b1d-a570-3c0815e43e57/rezilibufag.pdf
    • http://vomewudige.atwebpages.com/arquitectura_de_computadoras.pdf
    • https://uploads.strikinglycdn.com/files/cc4dbaa6-b578-455b-b9ca-b5c637fb9aec/pifuxororodefob.pdf
    • https://uploads.strikinglycdn.com/files/4157866a-4659-47f4-8c62-948dfae62494/charter_communications_universal_remote.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_off0000ee20.bin
dce3e60db59e10a6eb2c7fc7337517b4a546e472608c9918a3555326c65d5708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5568 bytes
font_01_sfnt_off000100e6.bin
b2b04bcbd9000133b964f83f6704cb10fe6a68053336a8e56c179b61791a8383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 10668 bytes

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