Malicious PDF — malware analysis report

Static analysis result for SHA-256 332ddf656e0045b8…

MALICIOUS

PDF

81.8 KB Created: 2021-10-09 14:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8e73aceee9cb982339a4bd62cbafc11d SHA-1: f4edb51d3f957aadbc70ce2d72e31cf7d73ac5f4 SHA-256: 332ddf656e0045b81ffaf349961b1f6c4a24f1530064dd16fbf962f0664cdcb8
146 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML classification and ClamAV, as malicious and phishing-related. It contains numerous embedded URLs pointing to disposable hosting and potentially malicious content, consistent with a link farm used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic indicates the document attempts to trick users into calling a fraudulent number, a common tactic in tech-support scams or refund phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=black+ops+cold+war+maxis PDF link annotation
    • http://sklepjola.pl/userfiles/file/puzozixisafipexegon.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdb7d0b214---zefed.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/vipumabelufenu.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/92115202278.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16150392e4cb9a---dupitaw.pdfIn PDF document text
    • http://lobi.md/userfiles/file/rabewafekoduparejazer.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/fivonawavoxojunipepife.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/35185055061.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/xapepip.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/64018171331.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/lasizezerenojodorabunik.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/18697647282.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/tigavutore.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/13363610010.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/tigudifolatupilinowamuvov.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_off0000d95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 18900 bytes
SHA-256: 971c937a84275f501d231ae9881115c6cfa983ffa3e5e19fdfaad050266a2f5c
font_01_sfnt_off000109c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C0 10676 bytes
SHA-256: 53f1d697d0557a801376752a0e1b8b6c13d3909bfe0792dea3f66f403875b2f1
font_02_sfnt_off00012258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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