Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f31192dff731934…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 10:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9bde1d8cbb3583a71d06b3f177dd598 SHA-1: 18ec7a6aa64c7b7739dc6099d6cbc03b3dc48c8a SHA-256: 9f31192dff731934c076db25d38f48674329b4e15897e5a44361b497d68dfa06
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging a PDF exploit or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thietbiantoanttk.com/uploads/files/1276209071.pdf In PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/1114908660.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/pebipe.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109101845098159.pdfIn PDF document text
    • http://biomehl.com/images/content/files/wexiz.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/pedupuwililoxaboki.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/kulukogababuverogoj.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/zovawulixaziru.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/milibonoxope.pdfIn PDF document text
    • https://barrier.exma.cl/ckfinder/userfiles/files/86582264248.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/tiraxow.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b7f2cfc9---vutubezamu.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/98030596476.pdfIn PDF document text
    • https://mauspro.net/upload/files/rasusumomizofed.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/34410440030.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/suvadumaxapamewuwujuvu.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/potikaburanowijojum.pdfIn PDF document text
    • https://petpetmates.com/files/editor/file/78280819681.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/85988075752.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/xedigawafeto.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/96029756578.pdfIn PDF document text
    • https://denimder.org/resimler/files/dibosum.pdfIn PDF document text
    • https://magicdiscoradio.com/userfiles/file/53529616495.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/dupasigizox.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/nixidegadigasubasij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=11th+business+maths+book+pdf+downloadPDF link annotation
    • 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_off0000d316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB28 21524 bytes
SHA-256: bc51ae672c432124136c038178e615a9217180818fe455c64a3590fed601ffe3
font_02_sfnt_off000120e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E6 11036 bytes
SHA-256: b5b922a01c7e5c5c52bc83b09326366522ca976d16f91741116a60e7c5c2bef4