Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cab13422c2bcad4…

MALICIOUS

PDF

84.1 KB Created: 2021-09-12 23:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 519163fb852431e46fae0bf76b96d6b8 SHA-1: 14d7c3c6675c0edd10ea9f1d62d5090baf421b99 SHA-256: 3cab13422c2bcad4a88e63806e5b2f977224796ec8c608a8eccde3332cd7fb89
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 identified as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://cructi.ru/uplcv?utm_term=how+to+disable+driving+mode+android PDF link annotation
    • https://korankertas.com/contents/files/jikinodomigokagi.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/zivit.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161305b840293b---1785932661.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/67073815764.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210905124901_OTYzMTA1NDY2MzE=.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/vefilatepipibufodijowan.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/rujekiluzagenozowa.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/3107935045.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/kefawafeferotofovem.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/vobimimonilopul.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/folisokoleniwuwobe.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210912114434.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/xamajebile.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dovabuworiwibejuse.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/96788378547.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/35036017705.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/16766801858.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109030051334810.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/79142570624.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/82198467909.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/wuzetudonu.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/b5d5f046a2813d552476072d4a096b7a/25272458362.pdfIn PDF document text
    • https://graphicart.ro/fckfiles/file/poputudegibilesexi.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_off0000e1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B9 18368 bytes
SHA-256: 6d88597df8f2c263e58f4c804026ec71919149971e3b7c2c7d6d58b92519e3f4
font_01_sfnt_off000111d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E8 10876 bytes
SHA-256: 67e26181d90f4c56902d0b2f7e17a2fc9cd549e9fa01428c775ba13ff603d27d