Malicious PDF — malware analysis report

Static analysis result for SHA-256 258bdc6d174e9695…

MALICIOUS

PDF

86.4 KB Created: 2021-09-19 22:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 404ceb1ab9f398170a9bab53b8c027de SHA-1: f27c2b722870520c05a1b981179298697bd2a028 SHA-256: 258bdc6d174e9695f0f155fda039b61d2eeda738440756ae21c972b4b6bfa526
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external websites, many of which are hosted on disposable domains or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the nature of the URLs suggest an attempt to redirect the user to a malicious site, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=chrome+not+updating+in+android PDF link annotation
    • https://soenen-pneus.com/upload/file/lavuzoxanumizoroniwebeb.pdfIn PDF document text
    • https://botroul.be/uploads/fexonexozejos.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210904100724881.pdfIn PDF document text
    • http://hkacca.com/userfiles/vonelinem.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pujulosifoxomesex.pdfIn PDF document text
    • https://ikima.fr/uploads/file/raxavipatijenejoxo.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/92156352238.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd34706cce---vupux.pdfIn PDF document text
    • http://superazs.ru/images/news/file/19884998994.pdfIn PDF document text
    • https://estoniapools.com/contents/files/89516602084.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406d2260919---92569424981.pdfIn PDF document text
    • https://avela.md/userfiles/file/98828824585.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/danogizu.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/98856492720.pdfIn PDF document text
    • http://kmsenior.org/file/files/tukodezekapurilak.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/42661571534.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/54087507541.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/39846487160.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/wipetibesev.pdfIn PDF document text
    • http://heizler.hu/files/file/sakekubomifotigumuzod.pdfIn PDF document text
    • http://zeci.nl/im/image/sofarasib.pdfIn PDF document text
    • http://generaldistco.com/images/file/92433400947.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 17368 bytes
SHA-256: b9df3814fcd0c99be4db53cc0a9605ceaf973a05bbf2eff220d2fa81357fe575
font_01_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13376 10756 bytes
SHA-256: 6579e7aec6fa82e227bba96979e50a456755d6ebe1fdba5c6b90ee7ac31aadb3

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