Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ed3705f66ae887b…

MALICIOUS

PDF

92.4 KB Created: 2021-09-20 17:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 367f5a210552fc73878a189e0841e976 SHA-1: 808e8d3e0958c5bc568a9d405bb5c1c3c003a991 SHA-256: 7ed3705f66ae887b8582a8f1ca04c72c6d11e19316830b58db9512723847dc43
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=free+android+emulator+for+pc+ldplayer
    • http://phuvuongcorp.com/luutru/files/76686621356.pdf
    • http://hanabi-la.com/uploads/files/datijeputewegowomupuxoj.pdf
    • http://archinfo.ru/uploads/file/40963640619.pdf
    • http://ugyvednok.hu/userfiles/file/zoterawofepo.pdf
    • https://resortweeks.pro/userfiles/file/36521683935.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613066e0de77b---naliwiz.pdf
    • http://turbotechnik24.de/userfiles/file/30064055946.pdf
    • http://entrackintl.com/uploads/87045435399.pdf
    • http://rurisnet.org/images/file/zefuwadalawugomukulo.pdf
    • http://tdjl.com/uploadfile/file///2021091121230079.pdf
    • http://labradory.pl/file/96378249670.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/76245968043.pdf
    • http://mn-print.ru/ckfinder/userfiles/files/47412329579.pdf
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/85274510118.pdf
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/zebof.pdf
    • https://ykitraders.com/UserFiles/file/vezizugiborugozi.pdf
    • https://muratay.nl/userfiles/file/moluwijawiwifif.pdf
    • http://hidramaco.com/files/files/rekunobutetaxaromope.pdf
    • http://transcash.com/ci/userfiles/files/79038073585.pdf
    • http://geasit.it/userfiles/files/sepovojopiwobafo.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_off000105e4.bin
07923c6d4d99659f260c99804e099d800dcb25d2ee03cab67b9d976f3208a3fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E4 17756 bytes
font_01_sfnt_off000133cd.bin
836b757be4180abdf26fa27b4460eefef57bc9faf1674bb4433f8f249846eeb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133CD 10804 bytes
font_02_sfnt_off00014ca8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 16792 bytes

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