Malicious PDF — malware analysis report

Static analysis result for SHA-256 f490019c9e87cd42…

MALICIOUS

PDF

71.8 KB Created: 2021-09-26 11:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20e54c37c585963208496e59bdd6fb3f SHA-1: 1bbf6ae3007cfaa8231d97b8d53d565d159f9ed4 SHA-256: f490019c9e87cd42a45bf75e72a933e8bb99c9511368e1ec9870cc7d54717606
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, distributing links across numerous disposable domains, a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is weaponized to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://conditum.nl/userfiles/file/fevajarebasub.pdf In PDF document text
    • http://an-professional.ru/img/files/file/63613431192.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/xofijapalupozemasuzupof.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/45216776983.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/kuwiterusifudekuko.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/3634345393.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/velenutimanuva.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/84588354114.pdfIn PDF document text
    • http://itscebu.com/upload/file/20210923101333.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/bewowejixefavufuj.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/jatibegibisarakit.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/poxupejejofunapazifuw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rhv1blnvet15j5ml6enlkqu1c4/1059549475.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d0ad7257c---fevovivazemedusidi.pdfIn PDF document text
    • https://yifff.se/userfiles/file/bedibeji.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/liforelizivegal.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/28876606930.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/46659440928.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/60217184922.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/lurenadewosepovojixedaruf.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/lazumizularojozesakexen.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/59424611938.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=save+web+page+as+pdf+macPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210907/16309558222334.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 10768 bytes
SHA-256: 27bd5eb8d5bb26c7f110e11e318c6ce1909ed5cc9ad5d2d826f75ff85cb94e72
font_01_sfnt_off0000cb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 18132 bytes
SHA-256: 89c13bb9bdac054cc3f9192fafe06dc310f7da7acc7e8d74edc901b532da02d9

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