Malicious PDF — malware analysis report

Static analysis result for SHA-256 827f991e9a016efb…

MALICIOUS

PDF

75.5 KB Created: 2021-06-12 10:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e4c6597a07c8e48383f282f86fb40550 SHA-1: 407bf6129e088cefa3f8add8125fc7e903fe2ef6 SHA-256: 827f991e9a016efb2ff5a5c28e9dddcd6e3156cb19a00fba53ce9af95d667685
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it is part of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO abuse. The embedded URLs point to various PDF files hosted on disposable or less reputable domains, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://catamma.ru/pbw?utm_term=compound+words+worksheet+for+grade+3 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389080/normal_5ffd52539c431.pdfIn PDF document text
    • https://zenimuxen.weebly.com/uploads/1/3/4/3/134317926/gekaviwovotoxip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463538/normal_60120a5db3818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_604a583390c97.pdfIn PDF document text
    • https://doxeraja.weebly.com/uploads/1/3/1/8/131871607/nuxuwolixatu-kupozakara-xegiguxen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473618/normal_6060bd746e2da.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502833/normal_5fcc608ff114e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383137/normal_60bbe6cb56bde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475586/normal_6064534239df8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_601eed13bc548.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_60bf3e5f3aba1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144832557/83257802679.pdfIn PDF document text
    • http://lulimogosan.pbworks.com/f/nubituwewis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c59070b-c6e0-4f3b-be0d-3cce5565c714/betigu.pdfIn PDF document text
    • http://gesugot.pbworks.com/f/blackmart_premium_apk.pdfIn PDF document text
    • http://divogatupum.pbworks.com/f/29158410178.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/f/los_castells_de_tarragona_worksheet_answers.pdfIn PDF document text
    • http://zalonuzojeru.pbworks.com/f/52242326748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecf2c47-e13b-4025-b8f1-e2834e870bb5/28072565412.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE25 5648 bytes
SHA-256: 0af01f0baf3e0ec80714aa1a688e239e14370bba140b53d83b15b9017f9456d0
font_01_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 11016 bytes
SHA-256: 7080cca4a23d64a43c3e13e49247d1018b5c838ba94d7ed23c4823d98d1eb811

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