Malicious PDF — malware analysis report

Static analysis result for SHA-256 af427522fe97f3db…

MALICIOUS

PDF

83.4 KB Created: 2021-03-11 00:23:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 24c5b83a0ccff3221338cf47aec6d89d SHA-1: 7dec1cb3a287af4e89886f47a447cb9ea9b35895 SHA-256: af427522fe97f3db6f9e3fbcda1b758538991f6ddb8b57e726e9f73004bdca61
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one pointing to `vilenefex.ru`, suggesting a phishing or malware distribution attempt. The PDF structure and embedded content indicate it's designed to trick users into visiting external sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=kohler+jacuzzi+tub+cleaning PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473049/normal_60390c9a38a0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444113/normal_5ffaa21830c20.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/hg9jdhf/jewelry_box_packaging_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469135/normal_6047c7178597b.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/Fm4jh1F/fizomozabokumekediwe.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/hsB5sjs/paxatapedumuveta.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/xuxidaderowugaseg.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/21187387543.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://uploads.strikinglycdn.com/files/6c50e2bb-85e9-4192-a416-2faba8af8540/harry_potter_original_books_covers_worth.pdfIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_6549a8f20652477984e33a5bf4ecce00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb43396-bc8b-49b8-96ca-906068dd52a6/explode_the_code_1.pdfIn PDF document text
    • http://zukegavodobuxas.epizy.com/biology_keystone_module_1_practice_test_answers.pdfIn PDF document text
    • http://fedasumenusum.rf.gd/what_is_a_data_safety_sheet.pdfIn PDF document text
    • http://livirava.atwebpages.com/97610202539.pdfIn PDF document text
    • http://nunoxemimo.rf.gd/60389717523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd76183-3310-428e-b9a0-2c702fc84827/how_to_test_vintage_vacuum_tubes.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/10402460457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7058858c-2bd3-43d8-87d0-b142954191e9/short_fairy_tales_with_moral_lesson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8120a5cf-47e8-40c1-b518-cc14f8c5762d/petsafe_collar_ul_275bm_battery_replacement.pdfIn PDF document text
    • https://8b8c7005-3af0-45a1-8e5b-a6902caa9335.filesusr.com/ugd/dbd7d9_eeb69eabd6f84da6b3c707a1f53addd4.pdf?index=trueIn 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_off0000fd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD09 5000 bytes
SHA-256: ff03827ed94cee625b70fb1621e927bab467fcc357ea39fdad3e57c318215a5c
font_01_sfnt_off00010e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E17 10644 bytes
SHA-256: 55d5e236fd500a3d9da01f6e0a0bc9ce4049b4f9ef89f22111281c095bd28599
font_02_sfnt_off0001327c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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