Malicious PDF — malware analysis report

Static analysis result for SHA-256 264697ba1fc2799a…

MALICIOUS

PDF

67.8 KB Created: 2021-09-25 22:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ba68b6230d6c7f486da53dff75868999 SHA-1: a18605923d92134ca747f6d5903ab98f42df46bc SHA-256: 264697ba1fc2799a18182c736d9903efdda8906399b1781a7f4cbe9a6f7045f1
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, with one prominent URL pointing to a site that appears to be a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF's purpose is to host many links on disposable domains, a common tactic for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pixomot.ru/uplcv?utm_term=android+phone+hard+reset PDF link annotation
    • http://www.uc-kushiro.net/images/library/File/78744680733.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/87995093857.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/mudatiwiloxajazewedoja.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/jivilasovebaturorewav.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210915_0329D3E85E8663A0.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/7070890505.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/repotutovilufobuga.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/37628031229.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/mopevuxizanuguxupewe.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/78591677236.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/17235937733.pdfIn PDF document text
    • https://cartolmania.it/file/dakowewusufelekuv.pdfIn PDF document text
    • http://plise.org/userfiles/file/duburugelumawaxebuzof.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/81624667488.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dot7o4kh6fadbspf05918esqpf/lutomupupus.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/bisajebuwapufexevubizak.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/9915652549.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091015133073499.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/39837673732.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/22578011505.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/maginini.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/88823172147.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138f31acc0d9---zikobekagawipurileki.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/golijugobusopafeba.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_off0000ae06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE06 14568 bytes
SHA-256: b19cd6a1c860605da19631ba5813652fc064788e5ee5d1be7ee748006fce1fc8
font_01_sfnt_off0000d271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 10424 bytes
SHA-256: fba1095ff5dd7eed68f751517ebe823f06492cd8578be689a09926f91f4d5fc3