Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f9442e622896e6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 15:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a66fdd85038becae83e7d3d8946c55c SHA-1: 78075342d5741cc0f1c236d31ac6e85369932ede SHA-256: 50f9442e622896e6e54abc8616bde146c025d3ffb29c9814d82ca6ca17c9e30c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the suspicious nature of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://njbeihang.com/uploadfile/file///2021090510055382.pdf In PDF document text
    • https://songhong.info/userfiles/file/90472083926.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/bapubuxolod.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/lakupisoz.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/21592208045.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/79756777580.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mevotijofosarolifikinexo.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/18891062898.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///97755905335.pdfIn PDF document text
    • https://poojaindiangrill.com/nbloom/fckuploads/file/576275519.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/42635564286.pdfIn PDF document text
    • https://kede.org/userfiles/file/dupasasizunilakaputadamo.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/59721665203.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/42094568520.pdfIn PDF document text
    • https://dm288.com/slicice/file/12663151258.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/12054520645.pdfIn PDF document text
    • http://profstil.az/userfiles/file/30872351538.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161391e66e26f4---94115706803.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/23288072469.pdfIn PDF document text
    • https://suncables.co/images/file/jumabifawabilelonoga.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/40318165003.pdfIn PDF document text
    • http://mansiya.com/uploadfile/files/jidigigudono.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/60704440798.pdfIn PDF document text
    • http://tion.hu/upload/file/96373712029.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021091708225199.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/83425603050.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/68796162442.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=delete+firestick+appsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 18400 bytes
SHA-256: a097f47cd916a2dd27c2e6d100365628b53906ac3941041203005b1a19427594
font_01_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 10344 bytes
SHA-256: a6218959ed6b5741e3c83465be697f45ec681add6ca11914d2941818f739d0f5
font_02_sfnt_off00012756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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