Malicious PDF — malware analysis report

Static analysis result for SHA-256 f746fe035828d97c…

MALICIOUS

PDF

79.8 KB Created: 2021-09-22 11:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3622b06592313ac1e812994ccc6a7310 SHA-1: 586608a8a2609fd44e3a647d43c240ae838d28f7 SHA-256: f746fe035828d97cd2926e65c514b0c40f8cee735a5ece8cd5698a5980166a43
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://crysiq.ru/uplcv?utm_term=third+party+apps+firestick PDF link annotation
    • http://sinorarechem.com/upload/files/ponomokivufazog.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/43509697395.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///nepiwipo.pdfIn PDF document text
    • http://chinazzjx.com/d/files/31383720604.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/53516338822.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16305207184768.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/xeziri.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f698db65a---44918341634.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/nufenofexepogewiju.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/nokorubikalamurip.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/tumexizulelinamev.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/vinuwugopilukipu.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/mowegazesovuvuvupe.pdfIn PDF document text
    • http://xtra360.net/campannas/file/50463594794.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/32342886828.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/8571425174.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/49576642603.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/68188106341.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/menopufoduzubitunefigeta.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/78499c5e9b411cbf5b89791a1e122bd3/nifaj.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/29364516335.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/xadojowap.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_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 17220 bytes
SHA-256: 9b532dbf02df56d02f7d99c18fcf8e6bc26559a2ae26f638f0c1b691af647197
font_01_sfnt_off00010194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10194 10616 bytes
SHA-256: d47a4da230ea828c73bc19fa63f7821c03869c3cac8285f63ab39eef3308517f
font_02_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1