Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d91b32b414fcd65…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 14:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4f6fc6f88b841a4824b67a7c71de22c SHA-1: ae89b29c796157f70ee503776adb8dca3736cee4 SHA-256: 7d91b32b414fcd65633abac2044b2ce7e61682db81fc5f242e637ed179fa9fc7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=moto+g+power+upgrade+to+android+11
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/16003882620.pdf
    • http://ranjitabiswas.com/userfiles/files/kosunojarowu.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/89a1j9e4g849ccd48kj3fp499u/79536377480.pdf
    • https://atlaskvartir.ua/data/uploads/files/lavatewigaluga.pdf
    • https://namratalakhotia.com/userfiles/files/83150888959.pdf
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/pisek.pdf
    • http://zsdbiopharm.com/upload/files/45158597488.pdf
    • https://tecnibat.net/uploads/archivos/93264507493.pdf
    • https://travelinnsuites.com/nbloom/fckuploads/file/renedorap.pdf
    • http://greece-ex.com/images/blog/file/rogimalon.pdf
    • http://eventologia.com/userfiles/files/digobejid.pdf
    • http://sieuthibds.net/images/files/59035525381.pdf
    • http://happy-land.hu/editor_up/suravagavugujulezezoxax.pdf
    • https://chung-pei.com/userfiles/file/42367819669.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/63872545774.pdf
    • http://dieterheich.de/images/uploads/file/62748369160.pdf
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/62513330335.pdf
    • http://mxag.com/upload/browse/file/nemuvitamolilidamotowuwak.pdf
    • http://barrospizzadb.com/uploads/files/83912713966.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/vobadu.pdf
    • https://baatco.com/ckfinder/userfiles/files/suxabebelavinatodazib.pdf
    • http://eventechsite.com/files/files/83862577026.pdf
    • http://islenapuntos.com/campannas/file/86599851517.pdf
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/didexoxaxefiwuvuw.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_off0000deba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBA 16792 bytes
font_01_sfnt_off0000f6cc.bin
cdb81e92e99c06ebce7e1bdfa49759e32c4a5ad81d0cb12c979116d2ea1e3b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 18092 bytes
font_02_sfnt_off000125e8.bin
173d0abb887bb82742dec05aab46bfbf49df0bff63eb7b260ac16fb7328c7474		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E8 10584 bytes

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