Malicious PDF — malware analysis report

Static analysis result for SHA-256 571e2bc1e3b9f5a9…

MALICIOUS

PDF

86.0 KB Created: 2021-09-18 10:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31c195427054e938f754b7ae3dc4067d SHA-1: c0cf8c7f20e551850ca2e5767ab6ce230e9f8276 SHA-256: 571e2bc1e3b9f5a91ae6f1d89c36ff91b2572869307b845b2aad569c1d510013
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous external URIs pointing to potentially malicious domains. The PDF structure and embedded URLs suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=nice+words+that+start+with+g+to+describe+someone
    • http://hugslock.com/app/webroot/img/files/33152599040.pdf
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/vinedepapoxaribukopinatan.pdf
    • http://mudrberanova.cz/userfiles/file/51475206166.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/tubemitorone.pdf
    • http://ktcyy.com/ckfinder/userfiles/files/kojado.pdf
    • http://mobydick-band.de/fckdata/file/9258178738.pdf
    • https://hantverksakuten.se/ckfinder/userfiles/files/tupiguwavikowugefosuvi.pdf
    • https://topinsolventa.ro/userfiles/file/kujejagesotosuru.pdf
    • http://rivebistro.net/ckfinder/userfiles/files/55180582249.pdf
    • http://nsdadventist.org/FCKData/file/kidaw.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/2hl051vrqr2qjjf4ctnrdup4nt/72106082036.pdf
    • http://murito.fr/ckfinder/userfiles/files/9850879164.pdf
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/mideforadonelimib.pdf
    • http://tahyuh.com/uploads/files/202109100751018245.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/kavumuwuz.pdf
    • http://leaders-adv.net/userfiles/file/vamelo.pdf
    • http://jun-travel.com/userfiles/file/9567961263.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/piwunedimivotubexerot.pdf
    • https://monyetmesum.com/contents/files/worug.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/86kn87djdov5nn62qslku8tms3/89322449683.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_off0000e918.bin
a4734b54e6150eabbb762e02a1dc668096663cdf51d80d55a3fef41916e07941		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 18384 bytes
font_01_sfnt_off000118ef.bin
ef8e3bb13a8d45b7f4a18464964149637cd215473a1f15d84d68ff54240b0170		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EF 10976 bytes
font_02_sfnt_off00013224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13224 16792 bytes

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