Malicious PDF — malware analysis report

Static analysis result for SHA-256 b336c202d9806230…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 08:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33222d29aebf3969d725a5a6c2f17dc3 SHA-1: 110e7b1230b1f916b296ffad7fcf02cebff9cf77 SHA-256: b336c202d9806230bf13c7c87eb7a06acdfa39aa59d6a04c659125b5fe62077f
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. The PDF contains numerous external links, many pointing to suspicious domains, and is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it is designed to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://exclusivelimoservice.com/ckfinder/userfiles/files/dikiramutozapu.pdf
    • http://mini-garden.ru/userfiles/file/rezerad.pdf
    • http://stagelight.pl/userfiles/files/62641845995.pdf
    • https://pointswestliving.com/ckfinder/userfiles/files/tunopofodapirajebuwik.pdf
    • https://mygoaltv.com/ipp/images/uploads/files/jupulubaxazo.pdf
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/95257658921.pdf
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/25635076795.pdf
    • https://nisahanpin.com/calisma2/files/uploads/xerumijejivuxewoxiwepolu.pdf
    • https://tonthephunglan.vn/upload/files/vobuwesafezitutazizosubu.pdf
    • http://aaaexpressac.com/userfiles/file/61708379458.pdf
    • http://synfarm.com/upload/files/38407301659.pdf
    • http://gojjang.com/uploads/files/lamefibinusop.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/botivifevuwananarogixonul.pdf
    • http://chenruichem.com/upload/files/ziforugefi.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/42392651344.pdf
    • http://www.bc-arman.kz/ckfinder/userfiles/files/delorozobekexew.pdf
    • http://omegapizza.net/uploads/files/86312623621.pdf
    • http://bbhshipyard.com/userfiles/file/33364548821.pdf
    • https://medicabg.com/uploads/wysiwyg/files/vatoba.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96399327d---dotosatofemekebadavuv.pdf
    • http://d-a-s.cn/userfiles/file/vosusa.pdf
    • https://webtechnocrats.com/upload/file/19084205385.pdf
    • https://bloc-immo.com/images/15769855693.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=padmaja+udaykumar+pharmacology+latest+edition+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_off0000dfc5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC5 16792 bytes
font_01_sfnt_off0000f7dc.bin
1fe490e056f18fa161cc1315d9e9b6e4ee04787ac91da27810a41db8a65c71f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 11504 bytes
font_02_sfnt_off000112b5.bin
346066397e3e0b1120ffaee1c73566d6b33803f8baa5f2838a641b8969062aff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 18800 bytes

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