Malicious PDF — malware analysis report

Static analysis result for SHA-256 f915c558acd798e5…

MALICIOUS

PDF

73.9 KB Created: 2021-10-09 18:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9b73c0d520df5aca945b43be7daa70f9 SHA-1: 20c467b055e1944a5791e9b1c77eebe04517190e SHA-256: f915c558acd798e5b80ffe8eb26c3a2f637497e457a2d8656f96cddb5d656f3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a phishing or link-farming scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is part of a network designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=an+introduction+to+the+constitution+of+india+dd+basu+pdf PDF link annotation
    • https://istocdukkan.com/userfiles/files/titaxumoseto.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/jekaf.pdfIn PDF document text
    • https://creativetalentnetwork.com/ckfinder/userfiles/files/44705736571.pdfIn PDF document text
    • http://rsentco.com/upload/file/tobaxeris.pdfIn PDF document text
    • https://proxus.nl/file/80164593942.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/burorekobirizej.pdfIn PDF document text
    • http://didopack.com/files/45095672733.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/bewutesagunaset.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/84211605429.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/30004323061.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/37725633899.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/73521323619.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/16895511682.pdfIn PDF document text
    • http://m2m2design.com/userfiles/18040510421.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/xovirinidapoxi.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021091205081717.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/xoweraro.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/rowutam.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/61717755669.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/gisitoj.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/30317693946.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/sinukumudejugotezugasu.pdfIn PDF document text
    • http://lecostationery.com/files/file/tizixejirurikuraxuwima.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_off0000bc81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC81 16788 bytes
SHA-256: b8d315ad37874b01baecc94c150d6ca7242c526492deac39673049eb8f5966d7
font_01_sfnt_off0000e86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10084 10892 bytes
SHA-256: 42ceb57d2742864e27fc3cdb7c179400b927bd16461ee01f5b7c3d45e2d2ca46