Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ca55e539c336a4…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 22:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccb615bc4d3eca0807141d99ac655eab SHA-1: a56c6f17d209206d507c79f1c6708e23cb6901f2 SHA-256: 41ca55e539c336a436d96db27c58f9a4d8968aa16c9043c06aa4ac66724aced4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links pointing to potentially disposable domains, suggesting an attempt to obscure the true malicious destination or to create a link farm for SEO manipulation. No scripts were extracted, but the presence of multiple external URIs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://studiomistretta.com/userfiles/files/timoxuwe.pdf
    • http://beamstraffic.ae/amb/userfiles/file/ligeviz.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613118511a482---vuwijuzo.pdf
    • https://milorem-service.ru/userfiles/file/62611661157.pdf
    • http://taixingchem.com/uploadfile/file/20210911010756822.pdf
    • https://gogreenonline.net/userfiles/image/fckeditor/file/karotexukis.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613e84e16a4dd---libeme.pdf
    • http://bulmarconsult.com/files/welivaxukajaxek.pdf
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98383897459.pdf
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/52337097021.pdf
    • http://ydyb.com/filespath/files/20210909191527.pdf
    • http://homeopathyhongkong.org/files/45629523793.pdf
    • https://joinvita.com/neu/userfiles/file/kidor.pdf
    • http://tzoetemondje.be/uploads/files/rebesosulunarutitu.pdf
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/61247623067.pdf
    • http://daithanhnam.com/upload/files/zexiberupogosamugeji.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17059094501.pdf
    • https://qpshouse.com/upload/image/file/rewisukawoda.pdf
    • http://canigrup.com/userfiles/file/12346022837.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/01829941c7a88e4fb9077a3b11148cf4/11147613610.pdf
    • http://phuquytravel.com/nguyenvanlinh/files/487081827.pdf
    • http://legalinet.eu/userfiles/files/pazidu.pdf
    • http://svarovani-tig.cz/userfiles/file/74593739340.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+monetize+android+game
    • 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_off0000d606.bin
a76c95c1f220f0f39bf5fcc9189c6801c1e9f4973745098fbee0cadba3102fc2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD606 10512 bytes
font_01_sfnt_off0000edb8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 16792 bytes
font_02_sfnt_off000105ca.bin
e16aaec47b11d31ab9f52f8dbd3e6fb077d5e42a7e6449db4cb06b59f53da8ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 17492 bytes

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