Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca58a0b94845e009…

MALICIOUS

PDF

70.0 KB Created: 2021-10-08 08:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a7156ceec710a134013d80ae01488870 SHA-1: bd03f21798b600d926db0510d046cb188be9af11 SHA-256: ca58a0b94845e00951f5e683ef970c9283e2b6af8d18306d1f0766f0722eb161
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dunaweb.co/bg_image/files/58091771084.pdf
    • http://shesob.com/file/files/27586464846.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137b476c83c6---19841947206.pdf
    • http://giovanniseneca.eu/userfiles/files/bubalewomabuwupatig.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/22174028119.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/64615292470.pdf
    • http://rungruangsteel.com/public/upload/userfiles/files/jetoxipirazozu.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/mitowajimafo.pdf
    • http://hyunsin.net/userfiles/file/jixerere.pdf
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/jawokevinudirotaxiwag.pdf
    • http://skalamatbaa.com/userfiles/file/38318291359.pdf
    • http://insureavisitor.com/userfiles/file/gikoxolexi.pdf
    • http://svazekobciorlice.cz/userfiles/file/26239569138.pdf
    • http://evaemlak.com/userfiles/file///fewilofuw.pdf
    • http://teusz.pl/UserFiles/file/xegofulinonefu.pdf
    • https://sledovani.gpshlidac.cz/www/userfiles/files/sezel.pdf
    • http://telesson.net/_UploadFile/Images/file/jezakevuridifewunitozu.pdf
    • http://fermobkorea.com/userfiles/file/20210928063323.pdf
    • http://kozszemle.hu/uploads/files/24665649542.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161353b0dd8c2b---rojunozugon.pdf
    • https://iuoshili.com/upload/users/files/zukerim.pdf
    • http://cistenivytahu.cz/upload/file/57401895922.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=conservation+agriculture+manual
    • 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_off0000af88.bin
6a3ddf4849646ab369cbbf9e4131bbc8d45d89342a7ef87e97b57e1d3c0b197c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF88 16616 bytes
font_01_sfnt_off0000d9b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B6 16792 bytes
font_02_sfnt_off0000f1cd.bin
9e26af7322bdc091e8e6d2a48ba861528d8c9167543826462aa0c1b103168e44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 10768 bytes

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