Malicious PDF — malware analysis report

Static analysis result for SHA-256 51b79b7e87bfc94f…

MALICIOUS

PDF

71.8 KB Created: 2021-09-12 13:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 56327fac1a649d82955e558e860470e7 SHA-1: bd5dd44e56c05a05ec0266a3a60ba47e1078b854 SHA-256: 51b79b7e87bfc94fbc69503d38d26e90915df9087e98efd33e54ecbbd3b1d0a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable hosting, and a specific URL related to enabling USB debugging. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's used to redirect users to potentially malicious websites, aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=turn+on+usb+debugging+with+adb PDF link annotation
    • http://cablexconsulting.com/Upload/file/jowekodukosewemuxitusarav.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/dulifujupev.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/12682906371.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/sokifa.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210911_CF1B86C6440260A9.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zetemapagexudiranapaj.pdfIn PDF document text
    • https://rinducm1.com/contents/files/25695472947.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/wijiv.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/25318516937.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/rivifobasexabekafozasal.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/beruxaroravonutaso.pdfIn PDF document text
    • http://video-cycling.de/files/file/pikeponozosesudo.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/vajokexu.pdfIn PDF document text
    • http://space-edge.com/upload/files/wofujosago.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138669eee488---75395352776.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/18845336415.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/minigidupasunuxerukezi.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/fimeb.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/pipixofaxatufekiv.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/bububebipeso.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/51311052611.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/43246357719.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/50328490.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_off0000b73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF53 10768 bytes
SHA-256: 7ff5c9ba8867fd6e657419cd46f21fb085279ae10cec87a49584388b4b859a6e
font_02_sfnt_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 16176 bytes
SHA-256: 7647307d89a029493d59eca95b33d65c058432f2d8a4e4afc41a65214a72b61a

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