Malicious PDF — malware analysis report

Static analysis result for SHA-256 948958705be0fc28…

MALICIOUS

PDF

54.6 KB Created: 2021-09-11 14:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41243e6039bf86b2136d2ecaf5feed59 SHA-1: 5c4472255882e8d94438c3bb644d0e7224958bfb SHA-256: 948958705be0fc2830fa9a516c6c42d2dd7bf5c84cf1d052152b926b5c216e4f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for containing a link farm, further supporting the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8503

Heuristics 4

  • 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
  • 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://infrive.ru/uplcv?utm_term=hungry+shark+evolution+game+download+for+pc+window+7
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/tomedumigipokodogarodol.pdf
    • http://michaelwilliamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11907252450.pdf
    • http://jjc-dev.com/userfiles/file/81039566916.pdf
    • https://seger.cz/userfiles/file/88426681453.pdf
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/29845433339.pdf
    • https://mattress-leader.com/media/tariwuwimegojo.pdf
    • http://honmamon-s.com/img_seminar/userfiles/file/96403345645.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1e4d862b---jelidi.pdf
    • http://serbanindustrialconstruct.ro/uploads/files/nabosigosida.pdf
    • http://derp74.fooden.com/UserFiles/files/tafig.pdf
    • http://usefchina.com/uploadfile/file///2021090515075761.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/7e7ac99b756d416ed9f269befb560087/tivenupexogomudilakox.pdf
    • http://pescepiana.eu/userfiles/files/dugobogum.pdf
    • https://fuze-pay.com/ckfinder/userfiles/files/36700815844.pdf
    • http://bbfederico2.net/userfiles/file/vaxokir.pdf
    • http://sevinctekstil.com/resimler/files/liketaxof.pdf
    • https://hotelgaric.com/upload/datoteke/10122363211.pdf
    • http://efuturesthai.com/uploads/files/88757743918.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b852.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB852 16792 bytes

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