Malicious PDF — malware analysis report

Static analysis result for SHA-256 90988091aa4a4059…

MALICIOUS

PDF

73.2 KB Created: 2021-02-20 11:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2d1cbf05acf5a06a4d350913e37ec3bb SHA-1: 29b91f5231cbea7e9022cb8ef2adfc5a34ec53df SHA-256: 90988091aa4a4059966ea2cf505f863cb81625c8d279af2bc68145290edebc3c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure designed to redirect users to malicious sites.

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://bologen.ru/wix?keyword=learning+opencv+3+o%2527reilly+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469106/normal_602ef4c4ee75c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450628/normal_602fd2b9cd505.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5ff60b73dcf27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5fc9d8b690588.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_601dd7c7f40aa.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/03394df7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_601160d1760d1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuluputig.epizy.com/creditors_clerk_job_description_template.pdfIn PDF document text
    • http://pinisexukatata.rf.gd/ball_blast_mod_apk_version_1._9.pdfIn PDF document text
    • http://ziwilud.epizy.com/zetorodenuraboso.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/battlefield_bad_company_2_pc_game.pdfIn PDF document text
    • http://pokizepifowuw.epizy.com/hennepin_county_diagnostic_assessment_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fivebo/asha_bhosle_old_songs_pagalworld.pdfIn PDF document text
    • http://jilerixam.epizy.com/45264603423.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 5448 bytes
SHA-256: c20367fdf769a52b6c11d71736f105cb25f079349104f61882d54b7567a9f017
font_01_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10284 bytes
SHA-256: a4aac1ee940388aef236a27425442ee048a644664ff59de606b3f44a0470cd77

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