Malicious PDF — malware analysis report

Static analysis result for SHA-256 924cc4131ea1204d…

MALICIOUS

PDF

71.5 KB Created: 2021-09-26 23:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d5675e68852a6386e3c12d93a2d84568 SHA-1: d63652b6a1c8f1d25513f7e6b5a22b4fd801ef00 SHA-256: 924cc4131ea1204dac083ba79f087929ffee8d69e846e20c4d9da8c11e1e2d26
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://astdubai.co/userfiles/files/79913273407.pdf In PDF document text
    • https://vasantviharproperties.com/userfiles/file/55646450960.pdfIn PDF document text
    • https://faceless.me/userfiles/files/jaxinadofogekajamid.pdfIn PDF document text
    • https://slide-bearing.com/d/files/61072900805.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210902192153.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/wisijuri.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/birupixusalabatonuki.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/84467357523.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/44790731365.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/sebaxexumorizuviwepefepeb.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/98103203430.pdfIn PDF document text
    • https://norservis.com/files/files/murobisuwux.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/geresofomazikusogi.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/wibovesad.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/rojoxiku.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xikirozivegofi.pdfIn PDF document text
    • http://gr-chem.com/upload/files/59745794255.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/12778938666.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16147259ea6b58---982648835.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/jilejagikizif.pdfIn PDF document text
    • http://contactfm.be/userfiles/files/xedaxokukotafasiwag.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/34473088926.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1614fbc0ce6eaa---wakinikerobutetawujup.pdfIn PDF document text
    • https://megashina24.ru/files/files/72080913062.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/zunaxamibur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=his+secret+obsession+book+pdf+free+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_off0000b358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB358 10920 bytes
SHA-256: d5f6e26c8e915b9e479aee6bebe7867e763d4d8e082df23ee9267b7497c876ce
font_01_sfnt_off0000cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC95 16296 bytes
SHA-256: 06dbf6169659e298a1a05dd4ad8b743be590deeb083f7aa2297953abf215c01f
font_02_sfnt_off0000f5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1