Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ba382e2094e71b9…

MALICIOUS

PDF

98.0 KB Created: 2021-09-20 07:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e74f0251c78c4a01299530b33e42876 SHA-1: ea82dd3ad2433aa03b7fd20e98bd08b107c7b51c SHA-256: 3ba382e2094e71b9586f9db2754657187c2c35b0eb95dc898f785872d219b9b5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of phishing or malware distribution schemes. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights its function as a link farm on disposable hosting, further supporting the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://pistant.ru/uplcv?utm_term=watch+ultimate+avengers+online PDF link annotation
    • http://aygroupmuh.com/image/files/kedabawojesibuxe.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/11381956274.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/norosojanafukafusagave.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/62494232914.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/kalisitigunimufujo.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/gapezet.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/kijogogamupil.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/wegezawateto.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/67596535585.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/80646664280.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/nikiterike.pdfIn PDF document text
    • http://email-database.info/userfiles/file/toxila.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/fibuwimokizezujito.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/73910948626.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/40727045716.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/66225478513.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/pexipilurel.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xexawidokamasexiboga.pdfIn PDF document text
    • http://poultech.net/d/files/wiwebimetekaxivejuzalu.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/japux.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kuginusoden.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/67801436092.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/wuxepegiluzovoduxobuwa.pdfIn PDF document text
    • http://goldmustang.com/files/files/lovisazovebora.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4db9ac6cf---putapowikok.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://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_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13212 10836 bytes
SHA-256: 0579c1192053b159fcba1e7b3a349e5d2abc9baab1bfab0f95462cdcdad5cc95
font_02_sfnt_off00014af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF7 18384 bytes
SHA-256: 63f1043fe0798297d16c23d28d25fe2283df62e1b69cfe723e041d9e3552b300

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