Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66f1b89dc74ca79…

MALICIOUS

PDF

78.9 KB Created: 2021-09-09 16:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 661701f5906b564a6c885c718232d981 SHA-1: 4a4fa78ca4c7fe8e078a3e193a6110aaf0f27d0a SHA-256: f66f1b89dc74ca79dda09952c6efd47a4d0a36f3bc73e3ab40185fa9616c38e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=io+games+you+can+play+with+friends PDF link annotation
    • http://www.greenfield-sustainability.com/images/files/68458807917.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/womefavoraloremezenobelos.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/kulomus.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/wudojad.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/61067102817.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/98119277691.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/dawolokibifutelakex.pdfIn PDF document text
    • https://lean-ds.com/upload/editor/file/nemarodixejodazofaxovid.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/5200949580.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/27850124009.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/49664248418.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/repojo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc335cc14e---kuxoge.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/wewabipewurokimuvasedez.pdfIn PDF document text
    • http://naviway.su/upload/files/bibazoluwebixan.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/kekuzalugosumolilizoxeb.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/48780917610.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/69459915250.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/72265067951.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/rofataxotimapiwojaz.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210904_901D797490C6F250.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_off0000cdb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB8 11320 bytes
SHA-256: 4c17d6dba26dbb6c2680a285b69bc0d0cc76a53bd7cc87dc0fa9f0c72a2aef47
font_01_sfnt_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 17976 bytes
SHA-256: 4a974eb16dbb34dbeeabf618862c4268d84e8ee958732fe740eacc4448ef4327
font_02_sfnt_off00011632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11632 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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