Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65371ddabd3387b…

MALICIOUS

PDF

67.2 KB Created: 2021-10-01 13:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c40b862b0480c9d0d215b71463837c7 SHA-1: 0bbb01e8a9769087abb804c2a8ef8907f343eaf8 SHA-256: b65371ddabd3387b9bb5ba1d94bce8703dd9c11d00bf557ee7f280e57c92cca3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or link farm operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=te3n+watch+online
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8920352ca---42280863418.pdf
    • https://flardochform.se/userfiles/file/werijexikenejebuwinikid.pdf
    • https://gkscam.com/userfiles/file/xokenuxarev.pdf
    • http://cross-winds.in/upload/contents/images/images/5330253812.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/59166327229.pdf
    • https://fanaf.org/article_ressources/file/podonixufo.pdf
    • http://box8websites.com/ckfinder/userfiles/files/13235621015.pdf
    • https://valerart.com/ckfinder/userfiles/files/tuvuxetamu.pdf
    • http://nincity.de/inline/file/gapoxapifabamedoxagifulaj.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161526de0cce6f---mapanedukija.pdf
    • http://honeycontacts.com/uploades/userfiles/file/jetanekexiriduluwuwexal.pdf
    • http://studiotravenzolo.it/userfiles/files/kewotemuloniwovujenubeko.pdf
    • http://pm-property.pl/userfiles/file/58240193785.pdf
    • http://budaors.varosom.hu/userfiles/files/59239208805.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/tavizifibatelijewuzaziwo.pdf
    • http://adwokaci-pila.pl/userfiles/file/dovofudeweru.pdf
    • http://driver-jazda.pl/upload/file/memezudazogijis.pdf
    • http://ayurvedicclinic.org/userfiles/file/mosagid.pdf
    • 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_off0000a8b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B1 16792 bytes
font_01_sfnt_off0000c0c3.bin
f20c042d16479e80db0767611cdb9049cd7295d64cc96695e2bbb1fce51d6d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C3 16188 bytes
font_02_sfnt_off0000e906.bin
47f62ae3cd8f6f326c627041b354a1ccf28a8a843f6332159390271f30a17a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 10280 bytes

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