Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39681b50e54d001…

MALICIOUS

PDF

89.5 KB Created: 2021-09-18 19:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f9ff8614f22578a4b93cc2f2aa1d297b SHA-1: 4318c670a29cf8a37978d8cdd03642ee3d16b980 SHA-256: c39681b50e54d001a4ae7bd58b51d2af9bbeff835a591632fa9d71e5e0e43bb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as a link farm, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304ab006318---nubife.pdf In PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/nuxosatodimisaguwaso.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/78157800297.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/20977450571.pdfIn PDF document text
    • http://alkanboya.com/files/file///vokox.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/gusit.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/padewenojetibonixizu.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/xaluwit.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/gasitovuzifegojipa.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/89607069428.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://centroolosprato.it/userfiles/files/26898222965.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/10511892263.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/sulurotonazevakovobuneta.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/gunefen.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/85507240474.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/30301549335.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/tupujikufenupaxidi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131676adce17---23616403884.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/pezewu.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/69768447651.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/zewoze.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/81315296122.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/naxitulobifano.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/15921380096.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+fast+times+at+ridgemont+high+full+movie+freePDF 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_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 17596 bytes
SHA-256: a059019ab4ebe163b1a2327ce0d86c163f9d2e6a1536803f89c2066b527955e8
font_01_sfnt_off0001261d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261D 11084 bytes
SHA-256: 0f16b69a9226d3cdbf977f326d7c83134753b22ef70ed9c29ec73b8e7a3cf70c
font_02_sfnt_off00013fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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