Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf288f0f832becc9…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 03:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4d82519466681dac3a4b2829a13b3928 SHA-1: ca5440a5f5a0335dd0954055b3302a2fd9ed7fdd SHA-256: cf288f0f832becc9c444030280033fc2dbb5a86b0226ec95e9784621d9535bfa
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of embedded JavaScript (T1059.007) and a high number of external links, many pointing to disposable domains, strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment (T1566.001). The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8282

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://mdteam.se/ckfinder/userfiles/files/95554843234.pdf In PDF document text
    • https://bloc-immo.com/images/6305423074.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/vutud.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/zizuxesunasovavosipinofa.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/23642202479.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/tuwiwavu.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210905153052.pdfIn PDF document text
    • http://videocycling.info/files/file/67150390372.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/3958043012.pdfIn PDF document text
    • https://fishboat.hr/files/rezikotepoxepesafuripuj.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/sibiwidovikabuzalejaxed.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/nanasuzobowogeporivip.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/tikanogigiditi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143df790f5a2---79290433406.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/16071276631.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/80614724241.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091807231773499.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210916195116.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/jigiravogux.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/jiwepifunijajesunibuda.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/nuzekureziwipigez.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/6254459282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=goblin+slayer+volume+9+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 11188 bytes
SHA-256: 75cd1f1f22b7c8b9dda64487d8fba94524ddc01822e8e8f033e58fe6d79c3a46

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