Malicious PDF — malware analysis report

Static analysis result for SHA-256 758f6fbc4d6bf8b8…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 16:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 07f5053eb93f56a76e44b61e552c1669 SHA-1: dbe0e301086e71e2905624ea72b4a30ce30e1231 SHA-256: 758f6fbc4d6bf8b862a96e02a870e06682129da1dee95592465ca79838f62257
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was classified as malicious by an ML model and detected by ClamAV as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links are indicative of an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://oniceh.ru/uplcv?utm_term=1965+mustang+price PDF link annotation
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342202a4bc6---nufunanaxatezadij.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/13791345166.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/45117364818.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rifosivuxajorinefurinefo.pdfIn PDF document text
    • http://airsoft1.ro/files/file/ponogibobomosifurawowa.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/jutukowudidutaxezoxugox.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kirifep.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///nogamaviwenefe.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wikurutomosatubesevirana.pdfIn PDF document text
    • https://lesura.net/userfiles/file/93997856404.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sabidixutenujabo.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/93300634757.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/tupuzifitotezo.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/41323297006.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/fejijubupawata.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/49821715484.pdfIn PDF document text
    • https://seikai.jp/free_images/files/galapiz.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/pimoxapigurubog.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/datakaxujitemirose.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/94694553342.pdfIn PDF document text
    • http://rafaelokazakov.com/file/gekimodawebumoda.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_off0000e079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE079 11076 bytes
SHA-256: 7f87870f4a798e8a28f3c2e8a450e71b58a7817bf2d88348fa41534935e25547
font_01_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 17604 bytes
SHA-256: 7a25a6af1af792b1934e3f0bf131da97742b59b1213e7e2e141007108179dcf7
font_02_sfnt_off000127db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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