Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5b383a7e9c21ec…

MALICIOUS

PDF

71.1 KB Created: 2021-11-14 07:43:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 75e09cac6ddafc555701d0b12d47e3df SHA-1: 3c25ab77557162b1df35f7e7bfdb49c6ce868ca8 SHA-256: 1d5b383a7e9c21ec528499823a9433ba58ce2b8f7c32f25d4ad4e7edfd299c52
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are likely part of a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=i+wanna+go+back+to+my+little+grass+shack PDF link annotation
    • http://qunjl.com/userfiles/files/95574078909.pdfIn PDF document text
    • https://kimcert.com/E/file/wifeku.pdfIn PDF document text
    • https://nomortiga.com/contents/files/rilorevekuz.pdfIn PDF document text
    • http://online-cycling.com/files/file/99106161124.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/xuwaligaruxumo.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156b480788be---pifovudugedujibagusi.pdfIn PDF document text
    • http://canoeing.by/pics/files/93349127936.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/64730159969.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/vararitixoguvavomaw.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/gufojenevo.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/tofatumulidu.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/lipidiminufagolaz.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/vuwonofuvurove.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/36463802716.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/32344924645.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/613243f3e6a5a.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f060cccafd---vedixum.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/54465196198.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/nikipufefo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/14985180434.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/13132368726.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/72455898402.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/mekadatinujulija.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/40261683110.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_off0000b316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 16324 bytes
SHA-256: 6f642f47ea3f215e65068ff9d8c1e1ac4a60849c79cbe4c3ee9992ec60210c0f
font_01_sfnt_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_02_sfnt_off0000f4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A9 11060 bytes
SHA-256: e325656588841bd54be140b5521fc909782ffc0eb23b2d64d0cd19af58161020

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