Malicious PDF — malware analysis report

Static analysis result for SHA-256 74815e08b8beff29…

MALICIOUS

PDF

74.9 KB Created: 2021-09-16 04:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 03fbe28312264b4f938fbede9d6b0c58 SHA-1: 4eaecd83075f4e5db4da0ada143730785e6700c1 SHA-256: 74815e08b8beff291d686577bf811b8532a815e2bbd6ea51d243a004f7505b99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is structured as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cructi.ru/uplcv?utm_term=can+windows+10+run+android+apps PDF link annotation
    • http://studiospazioambiente.it/userfiles/files/nivagiwifegeve.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/bovulimapafatilajimotig.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/fibedarijowetelarotigu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/82182687600.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/65867232306.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/pitofomujoz.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ragidopopovubexime.pdfIn PDF document text
    • http://erdbau-rauch.at/9830777139.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/74115331010.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/60014709281.pdfIn PDF document text
    • http://boldogelet.hu/media/96452092202.pdfIn PDF document text
    • http://dagmar-e.de/userfiles/file/resafexise.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400563526c3---86069531150.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/20278421278.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7e41e457d---36311277942.pdfIn PDF document text
    • http://fullx.net/files/13917969198.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/41630027750.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210907084804.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/32400692581.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/vuxesatiwoxusalasi.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/82608983477.pdfIn PDF document text
    • http://medrea.ru/upload/files/12314009314.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_off0000c1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1FB 16932 bytes
SHA-256: d5d2f4656240d93f5d4adc3c38a01c1b0bd5c0d9a5a7873d5ee7e52016c29e27
font_01_sfnt_off0000ee00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE00 10500 bytes
SHA-256: 84b4125ac2d94926dd0ec7808c5b2937468cf040424661dfac3e36bcefa50fe2
font_02_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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