Malicious PDF — malware analysis report

Static analysis result for SHA-256 12c0bb7893ad3d4d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 03:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c71688cd1e747922141802d752e75514 SHA-1: 536eeefea03167d93aac0b72bea2f3a43f70e975 SHA-256: 12c0bb7893ad3d4deeb27323a3caeb31fd9ae3e9dbc48a8e9de9daac09912d6f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to disposable hosting. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://crysiq.ru/uplcv?utm_term=the+conjuring+3+full+story
    • http://proxima-design.cz/files/file/24928009107.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/fidijam.pdf
    • http://car-zone.sk/data/data/file/jotutotuteluzagalasaboki.pdf
    • http://bandenplaats.nl/cmsimages/file/zumazizolozi.pdf
    • http://engcaphone.com/_UploadFile/Images/file/diloxufanemiributetobapa.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/takiwokagunefudak.pdf
    • http://hoteldanang.vn/uploads/images/files/35421009278.pdf
    • http://lobanowscy.pl/userfiles/file/pimunimobepijikesina.pdf
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/86255462881.pdf
    • http://vip-cond.ru/userfiles/file/votulafotonekipirixu.pdf
    • http://dubiliergarten.de/uploads/files/69101897896.pdf
    • http://chandigarhdatarecovery.com/files/file/17960428619.pdf
    • http://alrabbancapital.com/file/files/74100547153.pdf
    • http://incomingmakedonia.com/files/files/nepala.pdf
    • https://seedomoretravel.com/files/files/kaguvegojulomej.pdf
    • http://zoo-foto.cz/userfiles/file/78624660986.pdf
    • http://meghdoothsuzuki.com/uploads/243781345.pdf
    • http://schokozentrale.de/idata/98574009054.pdf
    • http://businessnavigator.in/ckeditor/uploads/files/11368115565.pdf
    • http://korio-olsztyn.pl/userfiles/file/77612688300.pdf
    • http://videotour24.com/data/fckupload/file/nelitegubibamaliton.pdf
    • http://accessiblevehicleservices.com/userfiles/file/sigonutisaseno.pdf
    • http://edu-family72.ru/content/images/uploads/file/vaxomunigelunasewaron.pdf
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/84931969823.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/xezepesetidat.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161525a940beba---kogorotazenediguba.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_off0000b5a1.bin
25815b3e28d07bfaa653fd377dc5ac800747b1171429d01157e3857fc9ffc558		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 17384 bytes
font_01_sfnt_off0000e223.bin
4e386b2c8b1c7cd47c9d99cd7faeb47df841d3ed648339b73408c6dc22b28fb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE223 10932 bytes
font_02_sfnt_off0000fb78.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB78 16792 bytes

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