Malicious PDF — malware analysis report

Static analysis result for SHA-256 94873c254efd17cd…

MALICIOUS

PDF

71.5 KB Created: 2021-09-16 02:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 676d1bc36e86871941997caf49a57a6d SHA-1: 4109f7baaf00753371b0974a45a23b02a1eca5c0 SHA-256: 94873c254efd17cddc30dc1b9a533346e4c09f79c7980877e73ab5c8a362e40b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious websites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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=x8+sandbox+play+store
    • http://unseretochter.com/images/file/xamodajaduseluputora.pdf
    • http://www.celso.org/download/kukopowinasoninoxefesiraw.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/62099280993.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f291638f24---nisivade.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/genodutiridotilibux.pdf
    • https://undergroundtakeout.com/userfiles/file/sitezoxifuruj.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133af18f081d---85722677766.pdf
    • https://mb-classic-service.de/userfiles/file/18895534240.pdf
    • http://escalierdurire.fr/ckfinder/userfiles/files/nivate.pdf
    • http://ih-consultant.com/ckfinder/userfiles/files/fifij.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/13524789148.pdf
    • http://pretaporter-pegah.com/userfiles/file/xawebitisimesota.pdf
    • http://myarrahnu.com/mo_images/files/zovigirutakupoziwe.pdf
    • https://hamasataccessories.com/userfiles/files/fofetisipetune.pdf
    • http://sirindhorn.net/upload/File/92806015092.pdf
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/dasamud.pdf
    • https://vicareyou.com/userfiles/file/24187463687.pdf
    • http://schokobrunnen.com/idata/bisejadexoteveduda.pdf
    • http://pdww.ru/ckfinder/userfiles/files/63718349692.pdf
    • https://collinite.pl/userfiles/file/femewunajivopuwikupirur.pdf
    • https://almuhja.net/ckfinder/userfiles/files/70300471991.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/xonin.pdf
    • http://studiomarazzi.eu/userfiles/files/94869628321.pdf
    • https://samavetpharm.com/userfiles/files/74371509135.pdf
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/30447711832.pdf
    • http://studioriggio.it/userfiles/files/75137550421.pdf
    • http://wsmr.us/userfiles/file/bamazuxilagixofuwineset.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_off0000b8f4.bin
6ed373bcdfd5aec20e07437868e72980314371947cb352440ca5185ae3f1c90a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8F4 15148 bytes
font_01_sfnt_off0000df26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 16792 bytes
font_02_sfnt_off0000f73d.bin
bdbcbab6dd189f5ea7d82656f0d067262c1bd6bc98dfe73c487a9313fe7fc222		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73D 10864 bytes

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