Malicious PDF — malware analysis report

Static analysis result for SHA-256 daf0a10d01907606…

MALICIOUS

PDF

80.3 KB Created: 2021-09-18 14:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bd18d681ed6ed4d6423c5ceb93c8f32 SHA-1: 2178a9f5a8e9724136d66e5fc0c8b7ee95fd2031 SHA-256: daf0a10d0190760651f4e8edc01a2ee83bb6bde9977bd603331ef80ce80bdba8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, and a callback lure suggesting a tech-support scam or phishing attempt. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to trick users into contacting threat actors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://marsanz.pl/uploads/fck/file/47306449018.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/248dd5e93f6a5c205725f7f8e667b68c/wumopap.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/42675640140.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/64711055915.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/demad.pdfIn PDF document text
    • http://autoneza.cz/UserFiles/File/62338719484.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/tipigu.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/fotofarip.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/dudenufevituxujug.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5445b2fb---bezozuxozusamiros.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/zijizavejufefakazurew.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/redijotekilobuxetujid.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/tifonotugukutuza.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/28373877637.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/19116325876.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/wajuge.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/91558467996.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/27453530402.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/27209087563.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/rutedonixixowasogebaxanon.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/78861715326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=all+in+one+video+downloader+mod+apkPDF 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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 18244 bytes
SHA-256: 4a2758d2a296650d886a44213ebf587d4bb903791dad0d29ba9b3a81a8b5fb44
font_01_sfnt_off000103bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 10512 bytes
SHA-256: 64afc2b72f12da02bc4fbf3955f018f989461201328baf3665394d4c399ae788