Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef25e6c7a16d3a1d…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 19:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: acc3fdc660abfc9cced9a2df3d7fb7e6 SHA-1: 2739150ff19efc53b348aba818fe1a1baa0a3029 SHA-256: ef25e6c7a16d3a1d0a7470c26f6ae64dfe177fbfcb6e59bf3eb44a34ddeb504e
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 are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://huntic.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+5+ppsspp+download PDF link annotation
    • https://zd-zeta.com/uploads/files/202109150850097228.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/jizutevizejizixopogati.pdfIn PDF document text
    • http://salwex.hu/file/dixudo.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/75477960000.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/11475674115.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/xitawupomakaf.pdfIn PDF document text
    • http://midospa.com/upload/files/36151144840.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/seniwaj.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c83ee5862c---11257022690.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/12030796098.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/91380260525.pdfIn PDF document text
    • http://mebco.ru/images/file/64266587323.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/fasenarupumi.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/81b9f5b107996a70c2ce1a93dad2c61f/98942639299.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/3011656896.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/pexetal.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/2901827364.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/misokojixewevozitikazos.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/ruvutimomiwokebifo.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/sufigetaj.pdfIn PDF document text
    • http://saint-party.com/media/file/voxof.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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 17780 bytes
SHA-256: a44bead9bce7bd4740cb08d0dce36779fd16d279d5c9a8ffbbf24bc36fc3f122
font_02_sfnt_off000107b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B6 10980 bytes
SHA-256: c6a3b356a012d889b1b9f8a1d7819d576c15cbfea01b7714be3ede7341a740d3

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