Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1abe00a5809db3b…

MALICIOUS

PDF

77.7 KB Created: 2021-02-22 16:52:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 4d7c64a40ca81e2265c789db7e01c60c SHA-1: ae5ca771fece8a91a3b3f59892803672c97ba48f SHA-256: b1abe00a5809db3bd153aa6eeb984b227636bfa263132bbb9d54dec38e6d24c3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing malware or facilitating phishing. While no scripts were extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/wix?keyword=patagonia+snow+guide+pants+review PDF link annotation
    • http://obzorov.site/vevelibodajowovapu3eee.pdfIn PDF document text
    • http://academic-club.ru/67185463360tfvjt.pdfIn PDF document text
    • http://ebay-coupon.ru/nusudefuwibx3pxf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5fc8da6560ec3.pdfIn PDF document text
    • http://santecmb-sarl.com/89050676397u7w4y.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/multiplication_of_surds_worksheeta8d9l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467936/normal_5fed153014c14.pdfIn PDF document text
    • http://itmax.info/architecture_presentation_template_psdl8gqx.pdfIn PDF document text
    • http://uablog.website/stoney_s_las_vegas_instagramf0uep.pdfIn PDF document text
    • http://konobemozitu.iblogger.org/51320225804.pdfIn PDF document text
    • http://topuniversityru.fun/rene_descartes_meditations80wy1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411694/normal_6029f4f6a72f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gozilum/audit_report_going_concern.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_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5128 bytes
SHA-256: 066cfd35190150108ad1090c5dcd09ed0c8a33bca1ef7fde4ac05c11863059e8
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 10900 bytes
SHA-256: bce6c768415f9c5a18f154eaab1d1caad8ff735dd1c0bfff50f60fda4ca72102
font_02_sfnt_off00011bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BAD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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