Malicious PDF — malware analysis report

Static analysis result for SHA-256 02c1c36386f9515a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 08:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84c2a5506c802ac9d561b3b0ce4cc950 SHA-1: 8597f01a4425155f4209bae2ccefe6e9837f804f SHA-256: 02c1c36386f9515a14d0424999a6f1836496048ef6486847be9aee90916610d6
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 of which point to link farms on disposable hosting, suggesting an attempt to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious content through numerous small, seemingly unrelated links. No scripts were extracted from this sample, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=windows+7+premium+64+bit+download
    • https://samajsutra.com/userfiles/files/80203869995.pdf
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/duximimikimuvew.pdf
    • http://mitcostruttori.it/userfiles/files/97071690219.pdf
    • https://listapp.in/ci/userfiles/files/29054659461.pdf
    • https://futurefacesmiami.com/uploads/file/rifopabuxowunuki.pdf
    • http://mebelhotel.ru/userfiles/files/56553038730.pdf
    • https://stdtekstil.com/upload/ckfinder/files/67778692640.pdf
    • http://b40555.handyfriendship.com/upload/files/99501352101.pdf
    • http://ifaistos.reality.gr/~triantaf/images/file/gajesupunukewujijotukesos.pdf
    • http://terminsk.by/pics/files/kosajeri.pdf
    • http://cuboni.com/uploadfile/hong202109230356052079.pdf
    • http://mrcubezpieczenia.pl/app/webroot/media/files/61758237235.pdf
    • http://veganogle.es/uploads/ckfinder/files/98747102200.pdf
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/vejugefuxamuvujen.pdf
    • http://as-eng.biz/userfiles/file/deziju.pdf
    • http://vuonlan.vn/data/upload/files/pakibefixekowelofefuwaf.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/58836668951.pdf
    • https://adsbudget.net/userfiles/file/kojuxofasiwexudapenoxa.pdf
    • https://zaragozadenoche.es/upload/files/16710925030.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/38312999777.pdf
    • http://fanti-fitness.pl/uploads/assets/file/27545724602.pdf
    • https://pmrmhss.com/userfiles/file/zukazaderadumakixoga.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_off0000b7b5.bin
194af69b4a7187897f5d9b9a3165edee3cff7c767f3df94385045ab7732fc02c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B5 11168 bytes
font_01_sfnt_off0000d1b7.bin
9540e5c1e12bbbcef45c1600f1dd7a9c9441a1ac449d6dbd74878bf9bf64b320		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B7 16356 bytes
font_02_sfnt_off0000fbe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 16792 bytes

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