Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b887757b92ca880…

MALICIOUS

PDF

67.5 KB Created: 2021-10-01 15:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 45cc7da0e84d116fe50c5b90f44039ea SHA-1: e3902228e4b03bfc97263306eea5b58f7a6c0901 SHA-256: 6b887757b92ca8803abee58818b003cf0bc6d862f5dd84aa7ab8c481e44cb7f6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 are structured as link farms, indicating a probable phishing or malware distribution attempt. The file's metadata suggests it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea that it's a wrapper for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/uplcv?utm_term=the+kissing+booth+2+123 PDF link annotation
    • https://hediyelikhanem.com/calisma2/files/uploads/jefosusifeluteraxulibup.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/64119535115.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/sb3hqdukcht8e5p7ev4pte66f1/41732341504.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef48e3bb2---bufiximop.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/xetuzobefotiloxamosuv.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/27133257908.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/rinuk.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/34782383443.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/gojenipow.pdfIn PDF document text
    • https://tierlistei.ch/downloads/menoxikegemetof.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/dogunix.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/kijubek.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/87501901692.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/12989912539.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/18663909175.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/wubatijiwu.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/70035058583.pdfIn PDF document text
    • http://rongqichem.com/upload/files/32262487217.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/zalasavoxaxowutovuf.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_off0000a98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA98B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c19d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC19D 15336 bytes
SHA-256: f22e0c43d0de4684c5f516f60f178ed9be4e5c5ed2f108a4757c6a94b9c71591
font_02_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 10620 bytes
SHA-256: 30dea6336a5d4ce4814a9405a5fe2014a4d09f2deac7396554c715d1799923fd

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