Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55338ddb9bfe115…

MALICIOUS

PDF

88.9 KB Created: 2021-09-24 11:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 954204b3de115a3a4f26b1ecae95c1f9 SHA-1: 0e50766e7b36fff17bfd53b1816c459323de576d SHA-256: e55338ddb9bfe115eaf06c3910f976c5fb1efffe112ce6cd60d022160de5a77e
126 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, with one heuristic identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. The PDF structure and embedded content are consistent with attempts to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bivalyracing.hu/files/file/tukafonurupofew.pdf
    • http://kelkenaghshband.com/app/webroot/img/files/wupitozoroxomopitesu.pdf
    • https://tutorsbureau.net/userfiles/file/37111133832.pdf
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/21725069391.pdf
    • https://grupa-energia.pl/attachments/file/jakedidanotebilusuj.pdf
    • https://neksav.com/upload/ckfinder/files/59284997817.pdf
    • http://wsp.pl/userfiles/file/wibojabonajaloma.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16147bfeccda44---40105962786.pdf
    • http://countryclaim.cz/userfiles/file/71887510347.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/68293040507.pdf
    • http://drironcat.com/images/file/85112099190.pdf
    • http://elitacasa.it/images/file/37676540289.pdf
    • http://kechengchem.com/upload/files/laranob.pdf
    • https://sssmri.com/ckfinder/userfiles/files/56369977676.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/40843438721.pdf
    • https://likeevent.it/writable/public/userfiles/file/vujoziribalaki.pdf
    • http://hakanhurdacilik.com/userfiles/file/wetomawixade.pdf
    • https://visualmotion.nl/uploads/file/gubefudavifini.pdf
    • https://cyc-catering.pe/disac/userfiles/file/47246236941.pdf
    • https://tranhtreo.com/images/ckeditor/files/biwalelawate.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c94b291383---poliji.pdf
    • https://businesslife.com/content/files/24864090716.pdf
    • https://bepxuyenviet.com/upload/files/75893184523.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=captain+america+civil+war+hd+movie+download
    • 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_off0000f617.bin
d84331a5655deb9479fed0af8f4fc9da887fb98df40b8f99ed0319e727826d04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 18000 bytes
font_01_sfnt_off000124cf.bin
12eac4a156cf6d00f1cffb8ce92c97eaac882d926f8fa50053c910e352ef7efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 10796 bytes
font_02_sfnt_off00013d81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D81 16792 bytes

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