Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2c31a14a3112d68…

MALICIOUS

PDF

70.2 KB Created: 2021-09-16 09:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7d1daf1a2610734a1b3c1ac3d5c80f4f SHA-1: e294e7d0b668c4da23031773dfd5d2275794e462 SHA-256: c2c31a14a3112d688e81df9c4fec1e54b2ce66aad2ee2e02052d075809d5f909
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a link farm with numerous links to external PDFs hosted on various domains, many of which are flagged as unknown reputation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a tactic of using disposable hosting for a large number of links, suggesting a phishing or scam operation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d4e3d2bf---94147804730.pdf In PDF document text
    • http://ls12368.com/userfiles/file/49982184549.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/70052362710.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/bivikelexurinalaku.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/tibekawivajiv.pdfIn PDF document text
    • http://badgerhillfarm.uk/gojotaxomabakatoduniw.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/57117717471.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/14454346477.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/farowavowewef.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210905030829.pdfIn PDF document text
    • https://huanghecables.com/d/files/29012189419.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/5107329714.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/labedinunovaje.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/fapodubaduxoriton.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210902020417.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39470315230.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/gogomonetomixolirajuwu.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/bokepa.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/nuxoxogil.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f812e68ffb---93445806415.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/manavozakalokonakegupakof.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/suralodisikekonexa.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109051806596722.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/50152097455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=7+rules+in+animal+farmPDF 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_off0000b512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB512 10208 bytes
SHA-256: 1ef675d27d063f245aa61723f5b6e2db37436e6d257fc937a06addd73a0ec9c2
font_01_sfnt_off0000cbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE5 15460 bytes
SHA-256: ab516fccdffd23d6c45abf629d11c4f948265fc122660f8c4ff99b48db245f77
font_02_sfnt_off0000f311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF311 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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