Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e9b6f4fe71b318…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 12:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 9b49d838014ee7297d270aa75c741201 SHA-1: a8036df4d78217d9f0c965ea2670b65355cc1b5c SHA-256: 35e9b6f4fe71b31860b96e8e3881f045cdd6d58eb04ad310cdc57f9175a5c628
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://orthodoxvaidikasanghom.org/userfiles/file/91884352647.pdf In PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/96929690591.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/64737583431.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/42095856927.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/sezenevewor.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/saxavezusezofazezemoletax.pdfIn PDF document text
    • http://93564497.com/userfiles/84785122627.pdfIn PDF document text
    • https://davaocarrental.com/images/file/godurejapos.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vogotur.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/9014350054.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/nibodigoleropa.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zisevugudoluxus.pdfIn PDF document text
    • http://citranco.com/users/files/tanuv.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/83889555160.pdfIn PDF document text
    • https://uat-tunisia.com/userfiles/file/52832611004.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613104c9c625d---30705097935.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/sumefobo.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/fokitawilaruvoz.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c6c046118---rutadej.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/90486047293.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/zawevanesakavuzelajusigad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=propedeutica+ginecologica+pdfPDF 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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 17780 bytes
SHA-256: 6a37fefa198b37ed42a6c424715e2aeedc64a2446387d2ef64ca041523f8bd92
font_01_sfnt_off0000f30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 10728 bytes
SHA-256: 9af2bbf7fc65d157f7edd5c219226fb07025769108b77da16befca3cecbaf04d

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