Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a59a7716e0ffd18…

MALICIOUS

PDF

73.4 KB Created: 2021-09-13 03:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe58032d4547126fc9e52ef9417bd108 SHA-1: 47e371df890d76a2b1cd6da7aaf3b78969441094 SHA-256: 5a59a7716e0ffd1855ec35620b2ef83fe2acc6fa16ca2c6cd8bad8daf5f20420
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful websites. The document body is heavily obfuscated, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=what+is+android+pin+code
    • http://rubensova16.cz/files/file/fegewapejuwogikabaxo.pdf
    • http://digifast.cz/userfiles/vuxefivufavosagozilaxerox.pdf
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210906110157.pdf
    • https://dortmundpools.com/contents/files/polegelizobajilu.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/xafuvibejonivonapafasom.pdf
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/begose.pdf
    • http://abwmechanicsville.com/uploads/files/40993813999.pdf
    • http://meuble-tunisie.com/userfiles/file/99933828671.pdf
    • http://pensionpoint.cz/userfiles/files/79088201733.pdf
    • http://mtjjt.com/2013/upload/article/files/210908115449079109km9an.pdf
    • http://ilsogno-bomboniere.com/userfiles/files/19773049068.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131f8eed1341---54127911759.pdf
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/gatin.pdf
    • https://tranthachcaodanang.com/uploads/image/files/ximibapub.pdf
    • http://offerseir.com/basefile/offerseircom/files/90879217441.pdf
    • https://youkuvpn.com/upload/files/zulufukadesaratosodo.pdf
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/80184699609.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tezazadinijosapaxa.pdf
    • https://wspaperbag.com/userfiles/file/45854633576.pdf
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/30634844798.pdf
    • https://jss-moms.si/upload/File/pesojan.pdf
    • https://maffart-guy.com/userfiles/file/lukaloxebov.pdf
    • https://total-sport.pl/img/upload/files/97561164791.pdf
    • https://sergiomauri.com/images/file/lapafuvixup.pdf
    • http://brainbond.ro/userfiles/file/pigaterate.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_off0000bd4a.bin
6c749904fb0cd9e023c3069054dd74a6b82b25d4087ada53d21bc2cbd9cb828d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4A 10556 bytes
font_01_sfnt_off0000d553.bin
9b1e1fe4d438ad09975cf2d9e33c9662446847257d211d93760e7b5f224e1b6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD553 16604 bytes
font_02_sfnt_off0000fff0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 16792 bytes

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