Malicious PDF — malware analysis report

Static analysis result for SHA-256 591118dc6f6b9d5c…

MALICIOUS

PDF

74.3 KB Created: 2021-09-24 11:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f4543c1996853d998701965dea6e1f8b SHA-1: efa38ce63aa464fb402eb1f31003f03c67e095cd SHA-256: 591118dc6f6b9d5cdcba5b6f2d09959e9c6de4df867dec55fa53e6be3e979385
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or redirection attempt. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://kaupa.cz/userfiles/file/kifujupokemagow.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141832e88c2a---22500066932.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/vuvopemefabun.pdfIn PDF document text
    • https://banghenails.com/upload/file/12495010192.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/96172744895.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/jukuxib.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/2604982225.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/nuwitusezoxarig.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210918221450.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/32315734570.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/sutozozuno.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/20365065866.pdfIn PDF document text
    • http://tradotel-riviera.com/file/nivamidijowox.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/28255411163.pdfIn PDF document text
    • http://esangsok.com/upfile/files/pojowekale.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/310440315.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/61767994351.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xivaxusoxewu.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/43875702762.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/87898778549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=samurai+live+wallpaper+iphonePDF 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_off0000bf76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF76 10580 bytes
SHA-256: 237e1bd57c260f573af37109b9271632b5b929570e9128d1b26eee0a774c39c5
font_01_sfnt_off0000d767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 17200 bytes
SHA-256: a09a7b543f91609b09aae957d3573c9fc8abed3d65532058095776d698e35967

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