Malicious PDF — malware analysis report

Static analysis result for SHA-256 6289924577fd14f7…

MALICIOUS

PDF

113.1 KB Created: 2021-04-25 03:30:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d2d252eb6db9e2cf678cd069591c5aa0 SHA-1: 8ea6b4231dac14b5e3211b2923defd6e3ea5d5a5 SHA-256: 6289924577fd14f73a8dd221ecefaadc656998fb3395ea07ac2b01022d4e1f51
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to product names and application details, suggesting a lure to a malicious site.

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/strik?utm_term=bose+acoustimass+15+audio+input+cable PDF link annotation
    • http://wiwajekirutiw.scienceontheweb.net/bubiwemofagoxaf.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/psychological_assessment_tools_for_ptsd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465269/normal_5fef1232a982f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446650/normal_5fe1b44cefc89.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/16572025146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/1720b41c-4dc3-42ac-bef8-53b46a9192e7/innova_3100_abs_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e02e156-a859-474f-86ee-7095c4cafef6/68946458027.pdfIn PDF document text
    • http://gexokole.rf.gd/16970667170.pdfIn PDF document text
    • http://seluxud.epizy.com/possessive_nouns_lesson_plan_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ccc8e92-22af-423b-be45-d5c3242ff639/what_are_the_five_languages_of_love.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c1e1b8d-8ac0-41b3-9432-f4690bda40b9/how_to_test_a_solar_electric_fence.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/ttd_calendar_2019-_20.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/livre_guide_touristique_agadir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc9f983-b20a-40c8-bd25-2b5c0a1a6395/62632227372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23df3587-8d1b-47aa-8e33-032d962d4018/60193673416.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_off000182e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E6 5488 bytes
SHA-256: b5d60ca6f88f769a6ecfce0f0612b8e0c29003cd07f5ca1f15cb9567cb517de9
font_01_sfnt_off00019582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19582 9824 bytes
SHA-256: df604a276d218e437806fba47cf09981b82f29ae16f288902830c4c1620da8f5

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