Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f12cdf15c35058…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 05:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e8e1be969d499e22a5a60bc1c327a597 SHA-1: 52131de6eab073a737ac41f7768397da0d710487 SHA-256: 97f12cdf15c3505833bdcdd9bd7ec0727b8b9c610f63d29d5c86ed13ff7a2bd2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a callback phishing lure. Although no scripts were extracted, the document's structure and embedded URLs suggest it is designed to direct users to malicious sites or engage them in fraudulent phone calls. The presence of numerous embedded URLs, many pointing to unknown or potentially malicious domains, further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://ventadeterrenosurbanos.com/userfiles/file/1012597160.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa83f3ea62---widipevowopaj.pdf
    • http://www.css-jp.com/upfile/files/2021/09/16/radizukuza.pdf
    • http://king-ber.com/UploadFiles/file/20210907100915216.pdf
    • https://southafricapools.com/contents/files/24658459254.pdf
    • http://indago-rovigo.it/userfiles/files/60926669913.pdf
    • https://obermeyer-modemarkt.de/upload/file/babaralikenupupij.pdf
    • http://gccde.com/downloads/blog/geust/files/xuwezukevugetelogogawiv.pdf
    • http://reklama-kemerovo.ru/files/files/sogubefej.pdf
    • http://dalnoboy.net/data/filestorage/upload/files/sikomivobo.pdf
    • https://lifetides.ca/cambridge/uploads/files/69190745318.pdf
    • http://whipitleather.com/userfiles/file/golibokidubudimugamux.pdf
    • https://tekmaker.com/upload/files/jawodadefafaxakatob.pdf
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916161325197508.pdf
    • http://allivecoat.com/userData/board/file/31019250442.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161422b5f0affb---28729923042.pdf
    • http://rotarycochinharbour.org/ci/userfiles/files/41193625189.pdf
    • http://costruzionibulagna.it/userfiles/files/xepewuvagisufug.pdf
    • http://sperrincaravans.com/images/file/60415933471.pdf
    • https://loyalangkorapartment.com/userfiles/file/nusuvuf.pdf
    • https://alpinashop.rudy-ra.com/files/86309274840.pdf
    • http://bluecars.pl/userfiles/file/fuvemofox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=doom+64+nintendo+64+rom
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E1 16792 bytes
font_01_sfnt_off0000eef8.bin
049cc9f26c121a7e69a2ce52d35a6d26bb23d5100a92772964875df61eb60ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF8 10280 bytes
font_02_sfnt_off00010615.bin
7a1f53bfd793152772e94cebb547cebd3b94bb86ed82da8d6571f4be7ea0f6ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 18400 bytes

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