Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f39845d95e5625…

MALICIOUS

PDF

80.7 KB Created: 2021-09-10 23:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfaa9ca4e9e66631329fa5dc85b87502 SHA-1: 1032410e6e74113fb4cb20d64909516163b40ab5 SHA-256: 20f39845d95e5625e7882b42e7934ee9deb477e7dda737ce43df9ea0ad8fa91d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of UTM parameters in some URLs indicates an attempt to track or obfuscate the download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gop2kenool17uhfvr5i4gfscq4/3748603907.pdf
    • http://rivucota.com/upload/files/lewanubelodutaxetexefod.pdf
    • https://eghamatsafar.ir/basefile/eghamatsafar/files/motitedopawoziv.pdf
    • https://robert-zauer.cz/userfiles/file/55570980568.pdf
    • http://chromavials.com/d/files/joguzogasakofedotimaxoloz.pdf
    • http://beergolfers.com/blog/images/file/10003070455.pdf
    • http://rockefellersgold.hu/editor_up/70560490493.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/rulol.pdf
    • http://vector-mebel.ru/uploads/files/xifitajutob.pdf
    • https://universal4shipping.net/userfiles/file/72609109511.pdf
    • http://jandenzobv.com/image_uploads/file/25063064546.pdf
    • http://manilag.com/FileData/ckfinder/files/20210905_9F2A7DEE4C1850F8.pdf
    • http://haki.vn/uploads/files/60004291230.pdf
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/powemurari.pdf
    • http://banquat.com/userfiles/files/kifatukuwopipabukelewo.pdf
    • http://biomax.shop/filespath/files/20210909162408.pdf
    • https://kaimano.it/file/44236331313.pdf
    • http://flyingkirin.com/uploadfiles/file/012247472007.pdf
    • http://ukrkarta.ua/fckeditor/userfiles/file/44257925203.pdf
    • http://rts-3.ru/upload/files/72248782369.pdf
    • http://besteva.com/upload/files/35049497772.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=thop+application+download
    • 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_off0000d799.bin
f39d080cf4ffca185399e7e1a5e9a228af7cdedf06a35c1f1ad359fea5a6363f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD799 10260 bytes
font_01_sfnt_off0000ee9d.bin
3884e101ad547b03b27faf25bed1ab93ee6ba02f9c733b0a4e6c5a330349bb1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 17932 bytes
font_02_sfnt_off00011d47.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D47 16792 bytes

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