Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79e09a509ecc7e8…

MALICIOUS

PDF

90.0 KB Created: 2021-09-22 22:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca2984bb8fd3b3f89db776fcd2a84ee6 SHA-1: b3b4bb08ca324d0c7baabac38bf1755e169cdea0 SHA-256: c79e09a509ecc7e8f0892fd08d3da8d5c0221178dd4b61b146423f858d5b57c2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains, indicating a likely phishing or malware distribution attempt. The presence of embedded JavaScript suggests it may be used to exploit PDF vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://catamma.ru/uplcv?utm_term=dark+souls+3+weapon+ar+calculator
    • http://cambridgekapurthala.com/damana/userfiles/file/fulagemugijuzepugixir.pdf
    • https://afma.pt/site/upload/file/24173400387.pdf
    • https://forumsevens.com/images/file/68710471469.pdf
    • http://fd-health.com/upload/ckeditor/files/39573529188.pdf
    • http://print-resource.co.uk/ckfinder/userfiles/files/11005125682.pdf
    • http://foxadv.net/file/24824404883.pdf
    • http://perilatomsk.ru/ckfinder/userfiles/files/37413552875.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/48658884724.pdf
    • https://nasco-ye.com/uploads/file/17491131797.pdf
    • http://puisan.ru/uploads/file/5445668142.pdf
    • https://nikunjfoundation.org/ckfinder/userfiles/files/15155186.pdf
    • http://renovfab-menuiserie.com/userfiles/file/82920284835.pdf
    • https://nisahanpin.com/calisma2/files/uploads/guvobovosofod.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/mixujejonukulikenegexoxer.pdf
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/66222451880.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/waxukemovedejafosun.pdf
    • http://namjapizza.com/app/webroot/files/sikulejireruzidifezawi.pdf
    • http://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/zelolegexaliximofa.pdf
    • http://hockeydh.com/files/ups/files/92966934617.pdf
    • https://aarhuskortet.dk/images/file/53794284890.pdf
    • https://jiu-hang.com/upfiles/editor/files/depitape.pdf
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1db943c7---50990254878.pdf
    • https://igruppe.no/ckfinder/userfiles/files/1164567355.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_off0000f657.bin
d133347c3fd99ccbd93c234ddde9d4859a47cf034441a41fd18ae9d580c161a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF657 10724 bytes
font_01_sfnt_off00010f48.bin
d12311d226c02bfedc68979e067d4f5b4ef33aac3be4ffee8cabff178b469ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 19564 bytes
font_02_sfnt_off00014252.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 16792 bytes

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