Malicious PDF — malware analysis report

Static analysis result for SHA-256 103f4ad334d903e2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 11:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0518211c55dba34d4e9248f6b70862f SHA-1: 38ba2381094118a2b3dd0e601cf55e7c923daca6 SHA-256: 103f4ad334d903e2ec4d6f9389954e8a87336498bee738a8ca11932086f7db30
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.520amis.com/upload/files/63006098449.pdf In PDF document text
    • http://sportservistocik.cz/UserFiles/File/94642411365.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/xofaxoj.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/80312254983.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/62580294421.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zafawesexibezesosu.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/37980719645.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/18962747936.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/4029003621.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/siruxi.pdfIn PDF document text
    • http://axwelindia.com/uploads/87752388429.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/63771185066.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/32121241973.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/99798880044.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/12768683878.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613417dc7b0a6---datemupurudanizuvimip.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef414816b9---piregokabosimivijedam.pdfIn PDF document text
    • http://geodez.com/pliki/file/16142974649.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/15927726620.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/95265236502.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/99930002428.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/bukidotatadosulutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+unlimited+pokeballs+in+pokemon+go+2020PDF 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_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 18720 bytes
SHA-256: 786d195017aa1d9ee05dced16a09a8d2664170c7afdf38f9127ac29eab01654d
font_02_sfnt_off00011a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A05 11284 bytes
SHA-256: 52df3ed73f493dd2435f3c463673bd3a5c2adde6189161aab4917b8c2032cc42

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