Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b49187ba6c9b530…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 09:24:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a5ad95cb34c9bc5dcd0d81f36339cac4 SHA-1: 71b7765cdb9a0bb3384d24006daa3e89527893fe SHA-256: 0b49187ba6c9b5301a24e4e464a8ec7bffd70870d7157d6fabb0cf84f210c45b
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 pointing to various PDF files hosted on different domains, suggesting a link farm or distribution network. The presence of external URIs and the link farm heuristic indicate an attempt to direct users to potentially harmful content.

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 http://findusafranchise.com/files/files/bixesizajavekepibek.pdf In PDF document text
    • http://sanfrancescovet.com/userfiles/files/numapovagizusijimijebaxo.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/fosugelalonedu.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/57549249232.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/sofupufunugurejuz.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/6279779282.pdfIn PDF document text
    • http://skncn.com/u/files/63300840275.pdfIn PDF document text
    • http://aimic.com/userfiles/file/tupoporalepig.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/nuwixatolatigive.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/dirujanagi.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/fiwasufewamuni.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/bunuwedivigekifofapoxupo.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/zulawotoxamonodejizukib.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/mugogepogebiro.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/savkho1q8aeamuc816m7d7qpdp/wawaw.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/nexonidamaliposajos.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/81661808538.pdfIn PDF document text
    • https://majubesar.org/contents/files/8738268951.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/2160651156.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/86310599822.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/41684511641.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/topup.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/zagalesuwosufetem.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/98976603867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+randomizer+rom+ndsPDF 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_off0000d158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 18204 bytes
SHA-256: 80a455844ba7a7074877b72d14d3fc8ac4e66e19c9e9f2b6890529cd1afae764
font_02_sfnt_off000118b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B6 10420 bytes
SHA-256: 49d9f4d7bb4e03ec79fab7e562e0506a5ee2d4afffe5ba95da5dc1c9b84d66c8