Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40f274cd4e54100…

MALICIOUS

PDF

77.1 KB Created: 2021-09-09 04:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c9709f45a510d48e59b516a4e33a7f7c SHA-1: ef66534f71202b23d90d1ff4d386c66c2d4d816b SHA-256: f40f274cd4e5410063cd389d3b2d8816e756e298934462169740e1726719a91b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=reading+passages+for+adults+pdf PDF link annotation
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/98332370863.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/19388905396.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/96947037514.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/42575712744.pdfIn PDF document text
    • http://proxima-online.it/public/file/57143197681.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/nedazopanetubibewa.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/10603429450.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/bemujobujesifivibifuwim.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/g65dupb4bei4a7l5n2rbjg7ja3/zevedikafizakol.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/63469113884.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/5754385310.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/95749587183.pdfIn PDF document text
    • http://artepcb.com/upload/files/guwodujitemulurukuviti.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/46342474674.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/88022823228.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/dowebasobetem.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/12285378078.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/27876838334.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/7473074472.pdfIn PDF document text
    • https://makenie.com/upload/files/41695930693.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_off0000ca3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3D 10816 bytes
SHA-256: 86add5f15aadfbe3a451f209eac3be4b2ee858b2da59e0cb7b2b27c22bef7649
font_01_sfnt_off0000e315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 17320 bytes
SHA-256: 1db1d120d194b3ed24bbfed6e84363a81817318e2c6d0eb095faab16a569909f

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