Malicious PDF — malware analysis report

Static analysis result for SHA-256 10e2330d53d4d62c…

MALICIOUS

PDF

71.7 KB Created: 2021-10-03 01:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73880e1028c439b572a747be13c3e3a5 SHA-1: c296ab0b20ea80806714bcea3dda427498133d50 SHA-256: 10e2330d53d4d62c36db7c0470efa765be27f6ee9cd65693830826cae0da1d6e
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, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The presence of these links strongly suggests an intent to direct users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://inwebjor.ru/uplcv?utm_term=leia+slave+to+jabba+the+hutt PDF link annotation
    • http://erulingua.hu/uploads/content_files/files/30092407692.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/21622800667.pdfIn PDF document text
    • http://ibb-online.ru/f/file/16395085951.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/90100552084.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/lupaxedamotuv.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614764e320b98---96691907301.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/tegid.pdfIn PDF document text
    • https://sim2007.com/files/fevutudoloruk.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/xekuminivamotuxas.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4cec726c5---sepekitenuvujokifudabeli.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202196183517170.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/nuwaganenurinipidejonewa.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/60707103117.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/mapomusoneged.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210919110646_ohikr2.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/mujoxawezosejovav.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/raruzamonebaruxadelaralo.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/wajun.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/jelakorumewaxudojud.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/5101076837.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/3034738188.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_off0000b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2B 10392 bytes
SHA-256: 4835cb161ddc65ccf6fff1859352ae6cf7bfd22c77da84b9a2ba1246a5a9e98f
font_02_sfnt_off0000e2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CC 17944 bytes
SHA-256: f00000e64c5904363755c12c91ffc3a7857e841870e282c18d05c0f51b918f52