Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed129f0749f257d6…

MALICIOUS

PDF

83.1 KB Created: 2021-03-23 00:25:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e425f6df1aaad2cf6e2bf81ffbfb8ff6 SHA-1: 139d423e6ceb2513a4bd286ceff4a1ef62f78449 SHA-256: ed129f0749f257d6643709d82ff09216844b58ffc2fe939afb14d42270dcff7a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('vilenefex.ru') that is likely used to host a phishing or malware payload. The PDF structure and embedded links suggest it's part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=cardiopathies+cong%25C3%25A9nitales+non+cyanog%25C3%25A8nes+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452835/normal_5fed4c7390475.pdfIn PDF document text
    • http://bagawixaj.mywebcommunity.org/filum_brachiopoda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503033/normal_5fe00ca28028b.pdfIn PDF document text
    • https://cdn.sqhk.co/rirelolut/ujgBMmN/79024278406.pdfIn PDF document text
    • https://cdn.sqhk.co/wevexifimur/Ziigiib/tawugedifasobepiru.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/igwcped/57744035038.pdfIn PDF document text
    • http://kobujiva.iblogger.org/tapafidejofuxumavebeler.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385415/normal_6011ea20d939a.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxosutuku/hghflKh/begejavokesizate.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
    • http://betiwewis.rf.gd/duruvek.pdfIn PDF document text
    • http://xisaripuli.rf.gd/top_10_us_cities_for_human_trafficking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a7144fe-0aea-4a9e-b31d-a4bacb383179/55706659741.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/jufefanamovogagutot.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/41244182390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a875c51c-21be-4bc5-8dbe-ab1f16253a04/67707999779.pdfIn PDF document text
    • http://gulizut.epizy.com/snacks_that_dont_contain_gluten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227df6b4-1af2-4c54-976f-74e6c1aeeb67/jobs_for_computer_operator_and_programming_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbce81b4-cc3e-479a-9c51-e5b539da5822/ravakewolow.pdfIn PDF document text
    • http://xiniwipilanaju.atwebpages.com/articles_of_confederation_dbq.pdfIn PDF document text
    • http://wemikovovafebo.epizy.com/5th_grade_math_multiple_choice_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/asphalt_8_airborne_music.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_off0000f38d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38D 5612 bytes
SHA-256: 81ab2c728105d3a9a25ef996a08c967be6af436e2f69b0c93cd4eaf4ffa6e33a
font_01_sfnt_off00010612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 12760 bytes
SHA-256: 4eb4fa60aafb40925f179762cd4e4ac067df53417b3f14969099b1b29c40a16f
font_02_sfnt_off00012e33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E33 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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