Malicious PDF — malware analysis report

Static analysis result for SHA-256 4344e692d6d09e73…

MALICIOUS

PDF

84.1 KB Created: 2021-09-19 13:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 794bd41e6389ed610c85426e939088fd SHA-1: a2c2cec8138a03d6e0a7fe6f14d644ab552cf467 SHA-256: 4344e692d6d09e7313bd138902f540982119827f18f5c062a65962a25ed3527b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of numerous unknown URLs points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://zabradli-znerezu.cz/userfiles/file/zuremume.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147100b63185---18493841417.pdf
    • https://hrmconsulting.biz/upload/files/mokatepapojetake.pdf
    • http://www.veslovani-vsb.cz/soubory/file/99738440218.pdf
    • http://china-engine.net/ckfinder/userfiles/files/17501044388.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210916100056.pdf
    • https://agri-mal.pl/userfiles/file/pefozod.pdf
    • http://hzxf.com/images/upload/File/nagokatov.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/68571904247.pdf
    • http://ahnil.com/userData/board/file/tebivolugemilo.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/79312926630.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/7754767057.pdf
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/18310848615.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d2015e6d---sofogetamofunezij.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/tutuli.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/gunoliduvovefojidun.pdf
    • http://vetcasatenovo.it/userfiles/files/nuxotinajazupubikef.pdf
    • https://zenmobile.in/jaipriyart/uploads/files/birujibunun.pdf
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/zidozeketanewexegerijebur.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/s5pbvk8mte8rerj8ddv8s55o17/joxilivukibunulosejipo.pdf
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/purak.pdf
    • https://sunkamalzemecilik.com/userfiles/file/depuzozosufuvide.pdf
    • http://sushrutproctology.org/ckfinder/userfiles/files/larivejipowakag.pdf
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/towejoguvigebirose.pdf
    • https://kham.vn/userfiles/file/2901389358.pdf
    • https://full-flavors.com/img/Data/file/bivemomiravenexolikuje.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+compile+apk
    • 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_off0000df43.bin
0bbd84720c1d7777cd59f903e37a1ad8ba0a05e4fda8803acb2d619a3e33afb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 10332 bytes
font_01_sfnt_off0000f699.bin
fa31522aec2ad53921ca4b1cd2d6d41683e55d95fefe0c39b8e556435d877eac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF699 19936 bytes
font_02_sfnt_off00012b0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B0A 16792 bytes

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