Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b641e5954c71d7d…

MALICIOUS

PDF

73.2 KB Created: 2021-09-25 15:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24f5d47ae33aad7fa871737c228e77f0 SHA-1: 2cde204f955d233419bc23cc81811a2bfd009937 SHA-256: 8b641e5954c71d7d80e79a46862c307b14c1e41fe9857b5da9806346899de41f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure and embedded links are designed to redirect users to external sites, likely for downloading further malicious payloads or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=construction+master+5+apk+full+free+download
    • https://kebecelectrique.com/upload/editor/file/71257438316.pdf
    • http://lepal.sk/ckfinder/userfiles/files/87047565632.pdf
    • http://doremimarlikinsaat.com/userfiles/file/motizonuweg.pdf
    • https://ichibaninfotech.com/ckfinder/userfiles/files/fitekoresata.pdf
    • http://epmachine.ru/d/files/pamobegozenupokowudabu.pdf
    • http://epicridesnepal.com/files/pepusuxifenagimivexi.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/03ef9e024294ff3891b29e29c6aa912e/13670351220.pdf
    • http://zatexpress.com/upload/userfiles/files/54346916811.pdf
    • https://dom4m.de/userfiles/files/21774548216.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161313905a671a---gugewijewit.pdf
    • http://eros-arena.name/eros/userfiles/file/94393009220.pdf
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/fogotasubejubejawamekirun.pdf
    • http://industrialsupplies.pk/userfiles/files/4943867230.pdf
    • http://stroisvias.ru/userfiles/file/82045535389.pdf
    • https://corpus.bg/files/fck/file/lolexadefanofora.pdf
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/64432580700.pdf
    • http://st03.it/userfiles/files/71049456296.pdf
    • http://minipit.com/data/files/37548399143.pdf
    • http://pro-customer.de/userfiles/file/tipiwom.pdf
    • http://materialdeestudo.top/userfiles/files/nofatoxepuzupatune.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_off0000b4bb.bin
df20317ae3e145c5ccaf1a6a2f9031018eea62f3bcc29db5407519cc865a322b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB 11224 bytes
font_01_sfnt_off0000cf2c.bin
2ffc5cba0809ee2f3e45082159798c92930cb83609ce8d6ec0ed7d6762301a4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2C 18460 bytes
font_02_sfnt_off0000ff58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.