Malicious PDF — malware analysis report

Static analysis result for SHA-256 e682d1f342e62c21…

MALICIOUS

PDF

73.4 KB Created: 2021-09-09 11:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 619a2b7c13fabf66f74f441b717e57ca SHA-1: c6c7c6173bf26e827422641e7103a718bc810e73 SHA-256: e682d1f342e62c21a45418d836f4b75049bf3d2836e0904ff0497c16a5908ef3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The document contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URI patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://oniceh.ru/uplcv?utm_term=unkilled+android+gameplay
    • https://plantbiochem.com/ckfinder/userfiles/files/dutaxujomexosojosebajuzoj.pdf
    • http://vivaibonomo.it/userfiles/files/7867480329.pdf
    • http://7seapharmtech.com/Uploadfiles/files/luzewuwulivomifojapazus.pdf
    • http://cbcom.eu/ressource/site-image/files/dimotekamadewa.pdf
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/81398198015.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/ralixisegamod.pdf
    • http://www.zywawiara.pl/pliki/89987006347.pdf
    • https://resortweeks.pro/userfiles/file/duwozafawiruduxa.pdf
    • http://kxqcgs.com/filespath/files/20210903084513.pdf
    • https://fasleh.net/Files/files/luzad.pdf
    • http://dichvu12h.net/userfiles/file/zeweloxesofotun.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/fisemebesirufilidinir.pdf
    • http://interstroy96.ru/uploads/files/94411710109.pdf
    • http://kamnitikamini.si/upload/files/wizaxizubepuwetodatoge.pdf
    • http://ahkkpcm.org/userfiles/pilularewunajinubisegow.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/15070335779.pdf
    • http://mg001.cn/upload_fck/file/2021-9-6/20210906014823503731.pdf
    • http://rogersdesignhouse.com/uploads/files/85724054838.pdf
    • http://bishnutoursandtravels.in/userfiles/file/zoxodakibeba.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/30003524247.pdf
    • http://roycraft.ca/userfiles/file/lemer.pdf
    • http://otworz-biuro-podrozy.pl/userfiles/file/nitomure.pdf
    • http://torremaggiore.sitmap.it/files/files/46029824346.pdf
    • http://pazarziraat.com/userfiles/file/80659783513.pdf
    • https://ruxthai.com/ckfinder/userfiles/files/jigabefixewevewe.pdf
    • http://taxplus.in/images/contentimages/files/47774200236.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_off0000bd98.bin
cd38ec297f710061cbb6bd75f1bb98b9192b2e6e4220ca06678e6d9fdbde7197		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD98 10684 bytes
font_01_sfnt_off0000d5c1.bin
988ce3b926525765773bad6b0535d182b005d26af57ef47f3c36c3b790b3f842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C1 16264 bytes
font_02_sfnt_off0000ffd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 16792 bytes

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