Malicious PDF — malware analysis report

Static analysis result for SHA-256 9972e5a38cfdfa4d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 00:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc3676d283b9ef93ba3a0d4f1fc93608 SHA-1: 256046a7b3f5a4f2ed53faab172045652a591779 SHA-256: 9972e5a38cfdfa4d94eb0f92b56bdf46a74ded586b252324dda154c95d72b5cf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, including one pointing to 'coretry.ru', which is likely used to redirect users to a malicious site. The PDF structure and the presence of multiple links suggest a link farm or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=botim+download+app PDF link annotation
    • http://lightningriskassessment.com/ci/userfiles/files/foxenipizofotipiripe.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/61348705354.pdfIn PDF document text
    • http://sbkf.org/files/files/xenugedojigasaju.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202109220342524527.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/dagunarikasiwilaxela.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/24187271614.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/85267068139.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/85025302039.pdfIn PDF document text
    • http://newshop.jp/archive/file/29581940335.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/nurajexazepugekavulugoba.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/sapidapiveritamuwutopoxug.pdfIn PDF document text
    • http://ymjgolf.com/file_media/file_image/file/fazalelitatoruji.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/25513281566.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/74799536031.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/41733312400.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/xinutuvuvutoboluwa.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/vizefigoseja.pdfIn PDF document text
    • http://studiopol.it/userfiles/files/renivotezu.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/kejidomoziwibabo.pdfIn PDF document text
    • http://speckrepej.com/upload/file/tigadewuzekapekojag.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/28672296113.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccf9628aa9---bavuwajogutoviworu.pdfIn PDF document text
    • http://elsped.hu/files/file/saladiwakobebipapofif.pdfIn PDF document text
    • 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_off0000b20b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA1D 16736 bytes
SHA-256: 09176633ca9997e07d0508d78723655dcbf4b6c65ae0a6915800e46b38924fa7
font_02_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 10292 bytes
SHA-256: a96060ee888d8dde62984be86bf5f9de16c9afa30689630206f65513b19f8c20

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