Malicious PDF — malware analysis report

Static analysis result for SHA-256 185b700cc49ba7ba…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 02:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c73677fad32acf85a9f5d59f1fb3c5e SHA-1: bcb1e38a016fb7fc3f621922f58e154d16e2f1ec SHA-256: 185b700cc49ba7ba14cacd6e4e264ed32bb32c0f342d27431bf28f5b5fed1423
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 or trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content or for SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://m-camper.ru/ckfinder/userfiles/files/lukig.pdf In PDF document text
    • http://bkht.vn/userfiles/file/bowunuwozulo.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/surakiwovokodavodup.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/fikobesagaloboliboxuloxo.pdfIn PDF document text
    • http://fibertechnique.com/tmp/file/rovuzalatiketamabev.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/97312326662.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/12639287651.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/41049511170.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/16103882576.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210906_5C1BCBE2A3B030BB.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/32409035544.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/32935703495.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/88216790631.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/84172791043.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/96452068989.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/42647177809.pdfIn PDF document text
    • http://posuni.com/userfiles/file/16647764693.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/b756135d05704045e8b02632488e6446/96441464251.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/popabekadikejuzewekafix.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/88954933562.pdfIn PDF document text
    • http://cobmedia.hu/include/46721401246.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/75072703028.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614448e264adc---91985226716.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/medub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+android+apps+download+for+pcPDF 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_off0000c673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC673 10580 bytes
SHA-256: aa6cf5e8a62d7b2f14d9bcc810591b5963fb3e1864b43baa51c4b601fe6b7b69
font_01_sfnt_off0000deb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 16568 bytes
SHA-256: 6dda9974233aa98eea80ad5715220430d718e07992fee6a6aaac04b513ef95d3