Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab71a070a64d481…

MALICIOUS

PDF

81.5 KB Created: 2021-10-06 00:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a7099932f7b3571b6bd924e53d9d2521 SHA-1: 3ff95e111167cc56dea79386669a5924be59a43a SHA-256: 3ab71a070a64d481640546646a202a8484297c0ef270b4541158d1f05462d34f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://medvor.ru/uplcv?utm_term=dr+dalal+chemistry+for+class+8+book+pdf PDF link annotation
    • https://ontogepszerviz.hu/editor_up/54403992532.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1615b44e7295f4---63448658897.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/zunulukapalasos.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/tejaw.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/52104258745.pdfIn PDF document text
    • http://gptools.net/userfiles/file/79275120942.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/lamexagosokileli.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210907060630.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/83517857050.pdfIn PDF document text
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/85155851808.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/xumukigituj.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/dukefozeg.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614e91361f765---8324872472.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/19986031535.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/69295612293.pdfIn PDF document text
    • http://gomail.vazoom.com/pictures/zagosugavebesemofalaw.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/72890624093.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/dezigin.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/zajodulutexopitete.pdfIn PDF document text
    • http://geotersrl.it/file/22780066275.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/zusuj.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/71182340350.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/81093041285.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_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 20464 bytes
SHA-256: c54a18c357a8d4e06c76ab727939ffa01a9bfe9398e3b6842b03dd778842f8ba
font_01_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD3 11336 bytes
SHA-256: 87b36a02283014679297b868fd2ca0f2dfe9b9e09c0c7741721ab06c40296d91

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