Malicious PDF — malware analysis report

Static analysis result for SHA-256 f313cd1ccce73dbd…

MALICIOUS

PDF

69.3 KB Created: 2021-10-04 09:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6377fb568789dc5b9d532915aec50fbb SHA-1: d16559861ca170fb53a34bf0ad871e1e993d190c SHA-256: f313cd1ccce73dbd7dcaae752f7c322c6a8483518a80eeaf403af70ad1c7d1bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for distributing malware or conducting phishing campaigns. The presence of external URIs and the ML classification strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=can+must+exercises+pdf PDF link annotation
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/366a43gks24p7qo95fpprgbjk5/23424669062.pdfIn PDF document text
    • https://gmt.twwebmarket.com/ckfinder/userfiles/files/99496537495.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/nenakije.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/45403183241.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/19723332820.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/wavefowimamuwulovasexer.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/befevefivej.pdfIn PDF document text
    • http://alvitraders.com/files/25882743895.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/41865896109.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210914_0B1895B6EA42CDFC.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/82106754105.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/83754285739.pdfIn PDF document text
    • http://myepres.com/HotelEstimator/userfiles/file/kefununefitebu.pdfIn PDF document text
    • http://geodez.com/pliki/file/33835153823.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/mibividujojas.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/junalum.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/59305425344.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/mepanoxaxatizogotuxotes.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/57426548546.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/13011399775.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/76415066042.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/33086631102.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/mrdrjocfhjns6mdn2lbhq9bc6u/sasozenegaputodanidiw.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/gefibenepiwe.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_off0000af9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9B 15364 bytes
SHA-256: eef295295f16d3acd9ef996cecd412bcb922d6fae87a1b0fec566f0861ff3b54
font_01_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF2 10848 bytes
SHA-256: 0463abaac76dc6133fbdd6e9638414768055ac41de3c7d0597db3effd3b5a8d2

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