Malicious PDF — malware analysis report

Static analysis result for SHA-256 7467162aa8578849…

MALICIOUS

PDF

77.8 KB Created: 2021-05-28 03:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fad5257f5f31fec8f8f0193c9a72866 SHA-1: 5046a1c945d0a5e2152a4517a66870b49c8e2c50 SHA-256: 7467162aa8578849254d9b5cb01cf2869cebc328b1acb5c757d1ece2be9bf4e3
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to suspicious domains and are indicative of a link farm designed to distribute malware or phish users. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content.

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-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://seumenha.ru/strik?utm_term=spawn+locations+valguero
    • https://jezemubo.weebly.com/uploads/1/3/6/0/136094449/6966101.pdf
    • https://static.s123-cdn-static.com/uploads/4394060/normal_5fc640b15c8bd.pdf
    • https://cdn-cms.f-static.net/uploads/4472491/normal_606694c514164.pdf
    • https://jobubati.weebly.com/uploads/1/3/1/4/131453688/pedorekamewe-kavozisosobido.pdf
    • https://warogowi.weebly.com/uploads/1/3/1/6/131606132/tavumo.pdf
    • https://zenerabu.weebly.com/uploads/1/3/4/8/134870876/rawafivev-xoroti-vovuripopisavuf-zixurasiz.pdf
    • https://vewewiganivobob.weebly.com/uploads/1/3/4/8/134852084/2464766.pdf
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/gazone.pdf
    • https://cdn-cms.f-static.net/uploads/4369781/normal_606a7c9cba64a.pdf
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/xikenojubu-repomavasuxix-luzekisosegir.pdf
    • https://kasapumaf.weebly.com/uploads/1/3/1/3/131397987/20e5dcca41cd3.pdf
    • https://cdn-cms.f-static.net/uploads/4370063/normal_6065d4219fe1f.pdf
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/tovekorufopidak.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/41cb77fe-599f-4957-8f1a-c6bda30852ab/disney_world_code_of_conduct.pdf
    • https://uploads.strikinglycdn.com/files/e3a374f3-2839-4be7-86a8-6d5dbfa9f801/5051396273.pdf
    • https://uploads.strikinglycdn.com/files/08675f93-bb4c-4094-8d13-d39c2257fe3d/second_hand_victorian_dolls_houses_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/56c12d63-1187-4bf6-9454-0a4cb766e8c0/88357577534.pdf
    • https://uploads.strikinglycdn.com/files/59f9b557-d4c8-4004-8867-dead9dd3aa44/mebiriwijisuger.pdf
    • https://uploads.strikinglycdn.com/files/d80bc6dc-be65-4f12-aa95-84a61bf15b1d/dudugitafufe.pdf
    • https://uploads.strikinglycdn.com/files/bd64b7fc-aa0d-480d-be58-f20ab7f3834f/what_does_queen_mab_symbolize_in_romeo_and_juliet.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_off0000f17a.bin
3289619a22e5fe6b864a13e82649a9aa7255fe37b6dc4432aac9daccbd7563c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 5356 bytes
font_01_sfnt_off000103dc.bin
42b121cc30f3aeccd66495bb6593d184c7b42ce5e54d9a15257991693602624e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103DC 11108 bytes

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