Malicious PDF — malware analysis report

Static analysis result for SHA-256 423bc8ddc26fa095…

MALICIOUS

PDF

68.9 KB Created: 2021-09-23 08:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b3caf3483ba40a8997533070a2c8c5f5 SHA-1: c0efa9b944ff276c5a2eaa92acddceffd39e70d0 SHA-256: 423bc8ddc26fa095fee62c17fc5bdf01971780aa8c4b5d85108bf8173a5eadd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The presence of multiple external URIs and the link farm heuristic suggest a phishing or malware distribution attempt. The sample's primary function appears to be redirecting users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=parametric+arc+length+equation PDF link annotation
    • http://feldbach-tourismus.at/files/ligopejirifobeloz.pdfIn PDF document text
    • http://moneymaker-gold.de/files/20954244268.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/dasokakifini.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/41023300103.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/vasexefoxoxinava.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/71477431398.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/93648844039.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/36850940294.pdfIn PDF document text
    • http://www.benyowsky.com/resources/files/51527787418.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/kofoninoxisagewitikuk.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210918081019.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/19282295483.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/72824336880.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613117af395c2---jimubovoxiji.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161408b6742f63---bakenut.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/gujibubap.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/vinegivireregerogamoxax.pdfIn PDF document text
    • http://artepcb.com/upload/files/tikovaj.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/60728329870.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/vosotofibuxaru.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/pabiwor.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/55289298216.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/38928255039.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/pezalifabaxiluwejaxe.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C1 14916 bytes
SHA-256: 92869ff4d8682b4ef72b5acdecb5f4a7e5d8a961c8fd9cd382684e0c2cd7e5ac
font_02_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 10756 bytes
SHA-256: f8d6366d15ac575811ada3e7963f690f6cccf95cdea083b4c82c7cd19506a4e8

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