Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d0d3a18524daaf7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-20 09:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 191ab28ea19690bf6fa603db7b3167aa SHA-1: 5542456a4ddeffff1e59838d48be656e965cedaa SHA-256: 5d0d3a18524daaf7383dee7cfac08cdadbcc361e39d863b608deda2f7fe12d3b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the link farm nature suggest the primary goal is to redirect users to malicious websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=perspectives+intermediate+student%27s+book+pdf
    • http://prodottoitalia.eu/userfiles/files/sejamolopifakugigovi.pdf
    • http://mamam.by/upload/File/file/68145343100.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e264b7dff4c22896d23134249adec455/45388235289.pdf
    • http://vektor-bezpeki.com/userfiles/files/37191689184.pdf
    • https://mondoaudio.it/img/uploaded/file/dinilafepipobafunuzum.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/jpddokohh54e2fou6228jilp6j/xaxozukuvaraju.pdf
    • http://jucal.es/images/file/jibepo.pdf
    • https://immo-macedo.lu/userfiles/files/47524091836.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/56992611375.pdf
    • http://autoachtercamper.nl/userfiles/file/luvosanifikixevomo.pdf
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/keterevujevufaduwiwe.pdf
    • http://ozdermusavirlik.net/userfiles/file/midesinilenevuzusunu.pdf
    • http://footstepfloor.com/upfiles/files/37583356687.pdf
    • http://webinaris.eu/ckfinder/userfiles/publics/files/73014829167.pdf
    • https://dom4m.de/userfiles/files/fezidiz.pdf
    • http://myucpb.net/userfiles/file/70634931.pdf
    • http://autowassenindex.nl/images/uploads/pikomezimazotomenel.pdf
    • http://mzch.pl/userfiles/file/26744796289.pdf
    • https://ooo-kenk.ru/userfiles/file/38698725849.pdf
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/ginegixaliwanovara.pdf
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/notariwepiget.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_off0000ec6e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 16792 bytes
font_01_sfnt_off00010485.bin
75ad80954674c91cfa6a48fd6dbf2c2b9d7cf1d7ed707fb903c28683162d50a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10485 11168 bytes
font_02_sfnt_off00011e84.bin
e4292b8f8f1eee73378547dee6c70bea1cd621f34a31d47b393fa2977a2091cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E84 16884 bytes

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