Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9308d60743e972…

MALICIOUS

PDF

68.4 KB Created: 2021-09-26 17:34:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cee1fce12c9fb60c288d9165e95c09da SHA-1: fed440770e9425d8513d7e3134c246585b26d24a SHA-256: cf9308d60743e9721c53e94095345bea199d4e757740238c1e8ec4fbb6721622
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifies the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://medvor.ru/uplcv?utm_term=hack+of+coc+apk PDF link annotation
    • http://519pf.com/userfiles/files/pujexejatibut.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/21533941012.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/ledizarawobiwidunedewuji.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/gepamekewazix.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/vetipifekarifojejanofafi.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/3693969339.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/74802065479.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/falewipezonobozaguze.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a7a336fdd---lomovexazuxonako.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/66112908581.pdfIn PDF document text
    • http://polletnv.be/uploads/files/likivonovari.pdfIn PDF document text
    • https://armenia4d.com/contents/files/68574118806.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138428d2d8d8---54814766636.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fosulozubak.pdfIn PDF document text
    • https://www.autopsrus.com/ckfinder/userfiles/files/ravisusazezobosus.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/92556442711.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109042010075041.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/zajagefifilejekusej.pdfIn PDF document text
    • http://nissan.e-library.tw/uploads/files/goruxalagimovupus.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/31748577080.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/pagabodezomazob.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210920_112352.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/lelapabotojuxot.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/90124189456.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/mijixome.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_off0000b13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB13D 14740 bytes
SHA-256: 4176c28a69ea6add0b373fc6ba361cae134b80a0eab0a013164e834a21d373b4
font_01_sfnt_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 9816 bytes
SHA-256: e83c1a3f2f51be8d412589f48c74be6a4cd03855d02295177b12da3c7ba9feb8