Malicious PDF — malware analysis report

Static analysis result for SHA-256 86df436fe431fbc0…

MALICIOUS

PDF

113.3 KB Created: 2021-09-22 14:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 96b445f382e22c737d7d6dd5e00ba2f3 SHA-1: 2c49909c7e0e9814e37222d65e9514666dbc471f SHA-256: 86df436fe431fbc0e8e1c781e0152e5998848464bbb3e3807f44a4ca64bc94ef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of malicious intent, likely to distribute further malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://catamma.ru/uplcv?utm_term=the+magicians+s02+torrent PDF link annotation
    • https://swift-tw.com/lcc/upload/files/75563616921.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/7623030527.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/44796527735.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/parumibabofomejugoda.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/kuguzufuwegorezilorat.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/potuwiza.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/koxeno.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/nimafifelodem.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/punalojemuzesezunejitunox.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/kugujirinepi.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/u2q4645godau4ivvnc7fatok35/fagesijaxuku.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/menetekasubemugopawaguk.pdfIn PDF document text
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/20984461127.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/41220559444.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/20445482381.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/rutexapafepabaraju.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/9418394162.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/64792202082.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/filaja.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/99604756753.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/lakesozuxuwobu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210918194737461214218.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/25411198a346c38cfd446e97ef2ad080/54057437827.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/putisenedirerepitaxoj.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_off0001573b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1573B 10836 bytes
SHA-256: b08e3007db84d19191be7b414aee8e016c78461dd5adea3d870adccb192b888b
font_01_sfnt_off0001701c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1701C 18632 bytes
SHA-256: 3aa5d9b488f65107db5ac6bffef6323058c097c635e6dd9d4402a04ee1f8a302
font_02_sfnt_off0001a029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1