Malicious PDF — malware analysis report

Static analysis result for SHA-256 de59a37229b79011…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 14:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 07e43489426e18b6a7d516093313b84d SHA-1: 35caba2cfbfaaaf27d8d3db21beb18fb2be75132 SHA-256: de59a37229b790114d4d03d28e208d3877b336bc6126f9fd024ab1a6cc7789d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/rujuzelejebosogal.pdf In PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/nezadawunijakoto.pdfIn PDF document text
    • https://norservis.cz/files/files/44778473652.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/51998152385.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/54629703186.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/lebunetabopubapixisum.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/wunoguvegepugobune.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/42914070680.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/tidituridopajatowixuse.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1630958810.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/5981c03231a272151a85c0ab59ffd160.pdfIn PDF document text
    • http://serenetour.com/image/upload/File/lefivi.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/wubobibewipil.pdfIn PDF document text
    • https://kuepancong.com/contents/files/72950570333.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e33b827deca598451c2c409e56b41170/lijuruxalowarapozagimuti.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161353ed0a44c6---fezurelobapakojuwivedi.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zowofakuzodebov.pdfIn PDF document text
    • http://zeci.nl/im/image/51583520977.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/45675620832.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/lufudumovogebemejezepetuk.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/kemaxadumiperapejevi.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/lupefidunakisakerawatig.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/1463521311.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/10542832749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=kodi+phone+remotePDF 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_off0000dc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 10272 bytes
SHA-256: 4e11ce6acd160ed3c63152f5c43f042ee914c349a48fc7979b290524886d7846
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 18920 bytes
SHA-256: 5247006377f114b66f22619849e7812c8e6745eab1cddbbd355418c64e234b41