Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b7313c8a842ad4…

MALICIOUS

PDF

67.9 KB Created: 2021-09-27 21:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b6caf13f58d463a05ce57cfe1e7a5593 SHA-1: 122b4728e3e2703c498683740028eb028815b197 SHA-256: c9b7313c8a842ad4c29f1b10c60bfdb4619c3a1e0f4346ef40de7655c1e1156c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it's an image-based document with a clickable action, designed to deceive users. The presence of numerous external URIs, many hosted on disposable domains, further supports a malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://kabelkyaobuv.sk/editor_uploads/files/sawazemixilitujurikivad.pdf In PDF document text
    • http://pm-ural.com/uploads/files/movipewisut.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/femamofogonowegabufutev.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/23387391330.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/45254428319.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/83088735868.pdfIn PDF document text
    • http://allasclub.com/campannas/file/59909369937.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/12862644740.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/fudonug.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/vixoladi.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/30885744088.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/vafuwunewakelo.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/30284139931.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/64202350795.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/wopedeju.pdfIn PDF document text
    • https://vanha.kokkolansuunnistajat.fi/ckfinder/userfiles/files/sumogalaxaponisikufot.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/40866801848.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e24d8e03bf---9347540453.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1a817a07cd1ec74d8a3a06d80490512e/xiditem.pdfIn PDF document text
    • http://indianmailbox.com/assets/images/userfiles/files/dutalux.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/2905027244.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/bakudijowosal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=watch+bohemian+rhapsody+onlinePDF link annotation
    • 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_off0000accf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCF 14412 bytes
SHA-256: ca5c3379da142cbb8437a70ff86ce0fc8658e833fa5362cd3d1eb519ddc652e5
font_01_sfnt_off0000d0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 11024 bytes
SHA-256: eed679e2217d30711b6471bcee77a98b18d72df452477d1fc189764734d23f32