Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab712a5cdfe865b…

MALICIOUS

PDF

70.8 KB Created: 2021-03-19 08:23:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: de31e01a7b85f6a3f599b0a96595a0cd SHA-1: 266ae56998595df0d6542f7608b71a4cb3038bc5 SHA-256: cab712a5cdfe865be8994801155cbc0c5b45dc78e79961457e391fa86132df01
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'vilenefex.ru', suggesting a phishing or malware distribution campaign. The PDF structure and embedded content indicate it's designed to act as a link farm, potentially redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=client+first+behavioral+health PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416811/normal_6014a13ac906a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425917/normal_600793abe4cbb.pdfIn PDF document text
    • http://mosquito.codes/supikugogorubolanozotdh8a.pdfIn PDF document text
    • http://jewlgems.com/safety_tips_for_warehouse_workfwf7x.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372072/normal_5fe6b444aaccb.pdfIn PDF document text
    • http://game-pro.xyz/xaralixinazofexijle8pk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369927/normal_5ff9b8597d2a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366325/normal_60475c44c0c03.pdfIn PDF document text
    • http://onlineeshop24.xyz/zoreret8vcub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_601906b34a565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469349/normal_600361d03fd1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451551/normal_5fd22aa4c0201.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459477/normal_5fe1a86f34353.pdfIn PDF document text
    • http://prizinsta.site/cuales_son_las_clases_de_razas_humanas_en_colombia5ce96.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_8a2805574834456bb671fe3af4ee97e1.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_c00be8f65066467798c6a6368f453c82.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/93937669481.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c2ba5a-7590-428a-9561-031eb46f1c92/81277724678.pdfIn PDF document text
    • https://6ce95562-7558-49ee-a7b0-b3003db3b0e9.filesusr.com/ugd/d13e1f_9916f01250da450db5f4816c580dd245.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/42167384-8d62-4b56-bbc9-37d625488936/fazato.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/46996766447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22811f6f-8e5f-4ba3-b922-b18af8721241/zejoxonazatazidurewul.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_off0000d83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83F 4960 bytes
SHA-256: f6617aa272ecaa8f7e1ea55459662047b759a6a04686ff2d0e8f6691bf607762
font_01_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 10768 bytes
SHA-256: 679fc682dc30b735fd6ade88534e175a2345f2b8ad55d9a4581ee1a01458e673

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