Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b0d819936a61776…

MALICIOUS

PDF

36.4 KB Created: 2020-06-10 08:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c84252155d5334f01e96caf9601f87e9 SHA-1: 4bb1ac0df51c46cc044752c6a21704e8deca01c6 SHA-256: 2b0d819936a61776322415e3dd682fd29397109cbf50de682f3e7f5e3af4b086
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a SEO spam or content redirection tactic. The ML classifier strongly indicates maliciousness. No scripts were extracted, and the document body is heavily obfuscated, but the primary malicious activity appears to be the mass distribution of external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mx.tubebending.info/uploads/1/3/1/4/131406444/131406444.html#bedava+animasyon+film+izle+t%25C3%25BCrk%25C3%25A7e+du
    • http://test.lightfastdesign.com/uploads/1/3/0/4/130489157/gemirelajolepa_xepafon_wimibibev_pusido.pdf
    • http://6u2ct6.bdgct.com/uploads/1/3/0/7/130739463/5061774.pdf
    • http://haydeecanovas.com/uploads/1/3/2/3/132303219/5360620.pdf
    • http://onlinesound.com.au/uploads/1/3/0/5/130544257/fuvabutola.pdf
    • http://orbitzworldiptv.net/uploads/1/3/0/5/130588710/30a3e7dae7e2d.pdf
    • http://woman2woman.net/uploads/1/3/0/7/130776415/4168676.pdf
    • http://andrewjbarrett.com/uploads/1/3/1/4/131453260/897271529f8.pdf
    • http://pabocora.com/uploads/1/3/0/7/130775388/siwuke.pdf
    • https://zonixivufov.files.wordpress.com/2020/06/51568879303.pdf
    • https://xebixadi.files.wordpress.com/2020/06/83084239767.pdf
    • https://fumeperotozu.files.wordpress.com/2020/06/62952482700.pdf
    • https://kupekitekef306591479.files.wordpress.com/2020/06/sikevilaxuvux.pdf
    • https://bojodexiwow.files.wordpress.com/2020/06/rotokijowujuzot.pdf
    • https://mevowavam.files.wordpress.com/2020/06/43051925933.pdf
    • https://kiburowunexa.files.wordpress.com/2020/06/36938248744.pdf
    • https://vokizowonaso.files.wordpress.com/2020/06/suluxali.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d66.bin
ccc5a995ef57c7af2b020479181a31833f435ffd120127d6c596b96a5574825c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D66 12164 bytes

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