Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18a03b2c8b88bdc…

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 21:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22c30bd39b83cdb340a80760aab01221 SHA-1: cf042ef67fa091892e756bd24d63ded9ebdecd21 SHA-256: f18a03b2c8b88bdc95cb366609b0cb0ffa83753c03ab29b679f092aee03e6cd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites. While no scripts were directly extracted, the PDF structure and URL distribution point towards a common tactic of using embedded links to facilitate malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://www.schule.havonix.com/ckfinder/userfiles/files/zesudamifotezapurebigaso.pdf
    • http://www.culturehousesun.org/photos/file/17503781852.pdf
    • http://i-harmonics.com/upload/files/53231949460.pdf
    • http://jenan.com/ckfinder/userfiles/files/71385931656.pdf
    • http://dalieuht.com/app/webroot/uploads/files/72025191480.pdf
    • https://augsburger-dartliga.de/uploads/file/vobebi.pdf
    • http://gocoachfox.com/userfiles/file/78513826009.pdf
    • http://keemunblacktea.cn/uploads/file/22141126141.pdf
    • http://yogaschoolofkerala.com/photos/editor/files/19302061859.pdf
    • https://jerseyshorepirates.com/userfiles/files/51573192005.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e175586d0b---8862739308.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/61331210542.pdf
    • http://skolicka.eu/foto/images/file/68563888960.pdf
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/katunarililu.pdf
    • http://salonmysliwskirys.pl/userfiles/file/nirofiraxoputiwokapugive.pdf
    • http://pass38.com/images/contentimages/files/80634981415.pdf
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/87551429077.pdf
    • http://runbo.net/upfiles/files/16317354054023.pdf
    • https://zagorjeadventureteam.hr/files/28608071345.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/34556991718.pdf
    • http://zhuxintrading.com/uploads/ckfinder/files/20210913/16315075658548.pdf
    • http://asbu.net/uploads/FCK_files/file/98897345494.pdf
    • http://henghuitong.com/jingkelun/userfiles/files/20210907233748.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb97d42d88---femipudimaraxeberebapive.pdf
    • http://satthachkhe.vn/image/file/37477558691.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pro+camera+by+moment+free+ios
    • 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_off0000b26a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB26A 16792 bytes
font_01_sfnt_off0000ca7c.bin
2e619ed72597cf16fa21ac8dd7b6bfce0521fd4ef31b77522f108003b6b9a695		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7C 18404 bytes
font_02_sfnt_off0000fa95.bin
ef0f2509c3c2fa5fab55fab20a41fbab5be16e3734923c2cfcd921387ad7b052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA95 10708 bytes

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