Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2bee9a327dd2182…

MALICIOUS

PDF

69.2 KB Created: 2021-09-20 10:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 426d01b549535bf9ee1339f97d7c5141 SHA-1: 8d20e773509c29b7ed85c7ba43ba58cf2912a48e SHA-256: d2bee9a327dd218200fb7f8e970ff567b501801299f18472ea454460539ab491
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous links pointing to distinct hosts, including the suspicious URL http://gjbbang.com. The presence of multiple external URIs and the link farm characteristic strongly suggest an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • 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 http://gjbbang.com/userData/board/file/36658519054.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e05f4017e9788432a8fd53990203c4bc/84086849511.pdf
    • https://astefin.ro/ckfinder/userfiles/files/3261097629.pdf
    • https://koncnc.com/genelresimler/file/3363401643.pdf
    • https://gulfsupremesa.com/ckfinder/userfiles/files/zemadasojarudokedegisukam.pdf
    • https://ustunbilgisayar.com/userfiles/files/77741187834.pdf
    • http://birdwatching.sk/media/file/47463156572.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613832ed6baa3---widizekojitede.pdf
    • http://phutungtdc.com/upload/files/5717360797.pdf
    • http://lnv-cnc.com/userfiles/file/lezonutozilogitudemuxag.pdf
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/bexaxijijuri.pdf
    • http://dinhvi5s.com/images/newtech/files/50453480439.pdf
    • https://viboot.com/ckfinder/userfiles/files/78205942514.pdf
    • http://nenayu.com/filespath/files/20210920142037.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=google+camera+redmi+note+9+apk
    • 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_off0000ac7c.bin
ed07f1c5a543b4fcce190564b3c5d407a9cf33a76db5b81fc751172a15a59ae7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC7C 10988 bytes
font_01_sfnt_off0000c5cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CF 16792 bytes
font_02_sfnt_off0000dde1.bin
cab4dc64b2e1a1d8e06768acd109ee70a433884311079ea928108c2cfe84ce11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 16532 bytes

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