Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65ec36863ef991e…

MALICIOUS

PDF

77.0 KB Created: 2021-09-18 22:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ee205f75e0475cf7716d65a28c9ffd15 SHA-1: f93a2eb92ef5428be2961d8d93ffe1eac24ad721 SHA-256: b65ec36863ef991e18701c3deffa4bf3d188ab7d5fbff11ee6455d91c44e2dd1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to a link farm hosted on various domains, designed to obscure the ultimate destination. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern of using multiple distinct hosts with few links per host.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://aquatherm-graz.at/files/wusesizokamet.pdf In PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kudufipijinuka.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25781799238.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/nasisutomemupabibosobu.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/pisutiviregobidebekedef.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nonimogoxufamomej.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/wumenotilapuzasoxevovofo.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/55671452637.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090201213655.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/munaki.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/xazamenuxa.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/lorosat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=huntress+spirit+of+the+night+watch+onlinePDF 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_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 17384 bytes
SHA-256: fa0e645b2bbad5ca70f5829d9114fcf3ee40c9ed6afa76d5d47e76f378e5fb67
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFE 10936 bytes
SHA-256: 47029900df5d12fdf78ce131fb98587f3ebe7e8841dd9440ab2210fd42fc5fa3

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