Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab0a615b8b173b9…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 22:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fc2e3da4d580bc5192823aa5a427da3f SHA-1: cb9c3994414874cabfcb07b33f4e7b629878ba4a SHA-256: 1ab0a615b8b173b9681dec973f324b189f57131045a840382ace36c16fe15fdd
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 domains and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host a large number of links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.vandiestbrandstoffen.be/uploads/files/towosapemanavap.pdf In PDF document text
    • https://sibconsulting.com/contents/files/2003828205.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/pupugularudupomofofogimun.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/laloxozosinuja.pdfIn PDF document text
    • http://kliknetezde.cz/admin/obrazky/file/komumur.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/93499585219.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wonoz.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/49812355320.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/kisalijikozipoxijoxo.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/9277667715.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/59809746972.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/65638622044.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b06d507cfc---rijizafoniwajen.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/40434744617.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/93506756390.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/15749266755.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/walelukopotunu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/zigujimubotunosu.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/bekobobe.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekekanujipanuxunegavisip.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ce1b647b---99636875871.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/dotudivefamimorale.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/gakiwuvoxudoxuxepulefuf.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/folumupikurozonujubevitaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=impressive+shayari+for+wifePDF 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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 10592 bytes
SHA-256: 67118459f41273a615d9502d98ebd01abf35cc47a89cf5d849cf4264096456be
font_01_sfnt_off0000dc65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 17032 bytes
SHA-256: e41766ce0e0e3fa32ef0daafc8b3beadbbda806096d75f7b3a777f31a00cb7f9