Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4bc2ee86ec1080…

MALICIOUS

PDF

78.2 KB Created: 2021-03-17 15:27:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e3865b6e8d06d73fa2e35f79e2980d8 SHA-1: 3c32573e4d1f3de2a93dae2416b455c075541869 SHA-256: bc4bc2ee86ec10806161158a3140283c509ea49789ecf09d43ed16d2f525ac1c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, a common tactic for SEO spam or phishing. The embedded URL `https://jumiwimov.ru/award?keyword=antropologia+pdf+resumo` is a primary indicator of malicious intent, likely leading to a phishing page or malware download. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing or malicious content delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/award?keyword=antropologia+pdf+resumo
    • https://dawejiji.weebly.com/uploads/1/3/4/5/134505451/2686101.pdf
    • https://mozufidapu.weebly.com/uploads/1/3/4/0/134012608/laleboxol.pdf
    • https://cdn-cms.f-static.net/uploads/4425487/normal_6035359cb19bb.pdf
    • https://cdn-cms.f-static.net/uploads/4366959/normal_60418ea288533.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1d3dade7-b166-4ee7-a637-86d3723eccdd/empleos_en_empacadoras_de_aguacate_en_uruapan.pdf
    • https://s3.amazonaws.com/wozowuledij/rizuw.pdf
    • https://uploads.strikinglycdn.com/files/9ecda80a-8117-4390-832a-f14583f8ebce/juxizamonogifagipesilod.pdf
    • https://uploads.strikinglycdn.com/files/694a754a-7a6a-4288-907d-dd382b67994c/willy_wonka_and_the_chocolate_factory_1971_movie_clips.pdf
    • https://uploads.strikinglycdn.com/files/c0d09b5c-e45b-41a3-852d-8ed76888831d/mujekenufulede.pdf
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_1a07491a26e3499fbc88b38cf13cae32.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ae15e73c-32e3-4611-837c-a1c5e6f86c8a/marvel_comics_characters_names.pdf
    • https://s3.amazonaws.com/fifuto/52028493658.pdf
    • https://s3.amazonaws.com/gosete/16357183410.pdf
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_e465be7efbfc4ac8a5ff02e131e8e1c0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90769162-4223-4ffc-986a-a27861a964f7/vicks_mini_cool_mist_humidifier_manual.pdf
    • https://uploads.strikinglycdn.com/files/ba0133a1-8526-4e08-ad0e-6c0a5f8f6332/the_elaborate_entrance_of_chad_deity_full_play.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_off0000f11d.bin
0d425e0067daf68dcfda8edf0aabaa7a10d4779d505c4cd80f49cc62f92c68d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 5348 bytes
font_01_sfnt_off0001033b.bin
dc6f2ff850462bcb3f9f531eb54e2941a1b8b3131f1892d4f4169a215c4ed406		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 12996 bytes

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