Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5aee22402bc7a8…

MALICIOUS

PDF

90.1 KB Created: 2021-09-18 09:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7b1695ee37ed8194d913bf9eeba21b3 SHA-1: 957e073063fc228bbe784e365c3deb830afdf444 SHA-256: 3d5aee22402bc7a8a515f028d12f06bbb235be3591b4a06cbd0a10480d1ba444
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://nomylo.ru/uplcv?utm_term=the+abc+murders+pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210903_045758.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c56e210929---subosopojajog.pdf
    • http://massageindex.nl/images/uploads/58182809157.pdf
    • http://firsttimehomebuyerstudy.com/images/file/xamujalufo.pdf
    • https://mihalex.by/files/files/nopakuwuwaved.pdf
    • http://delfosventures.eu/userfiles/files/14000647835.pdf
    • http://tlumacz-francuskiego.pl/userfiles/file/81687581963.pdf
    • http://idroter.org/userfiles/files/52929111742.pdf
    • http://www.dean-cpa.com/files/adminpic/file/jowafep.pdf
    • http://christ-china.com/filespath/files/20210907170439.pdf
    • http://conelser.hu/fck_uploads/file/39604113796.pdf
    • http://geotersrl.it/file/jawexakugemu.pdf
    • http://sentai.cc/data/file/20210904_123258_794.pdf
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/zuruzezimi.pdf
    • http://ibtaker.ps/userfiles/file/15255899591.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144839f4f1f5---71505056671.pdf
    • https://salondumariagededijon.com/userfiles/file/12835703214.pdf
    • https://perfecthospitals.org/FCKeditor/file/zipazelanono.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/84739077529.pdf
    • http://chono.mn/uploads/userfiles/files/mejogefabewevinivil.pdf
    • http://baiduvpn.com/upload/files/zevas.pdf
    • https://partroyfuneralhome.com/partroy/assets/file/91258141243.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/10618436090.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_off0000f838.bin
4328e2db1e4b90e37bcb0b5e2854a7cca55f6d3dc5c40d2e0038a1255653710f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 19692 bytes
font_01_sfnt_off00012b51.bin
3452978c8ef6cb2c3898b5fce6ba81bffd32912ed564ef2029d89f44dc7b353f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B51 10628 bytes
font_02_sfnt_off00014362.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14362 16792 bytes

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