Malicious PDF — malware analysis report

Static analysis result for SHA-256 4622b7707e870478…

MALICIOUS

PDF

81.3 KB Created: 2021-09-18 22:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3d22bfb39d97c304d6a130c998e5096e SHA-1: da4c519f6466bb9b4273620f8f8b0315b68b41ed SHA-256: 4622b7707e87047826fa8a52a9b3063b40e755acec4feefc4bf076310f239240
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous embedded URLs, with one specifically identified as part of a link farm on disposable hosting. The presence of these URLs suggests the document is designed to redirect users to potentially malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://crewmak.ru/uplcv?utm_term=video+maker+with+song+apk PDF link annotation
    • http://baugeraeteverleih.de/benutzerdateien/begexakagosijixonanopezip.pdfIn PDF document text
    • https://media-get.com/userfiles/files/vonupukozezawefumosugu.pdfIn PDF document text
    • http://mcutech.net/files/julunemaguvobifoponuzike.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428cbd6d576---zanivuponinuka.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/71642027358.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nurufovodusajezifi.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/23234060312.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/subosiwuselikosofi.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/77718832629.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/tapikarenu.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/lasobuwububevaxox.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/30564604905.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/40880772969.pdfIn PDF document text
    • http://vhz.cz/user-files/betikopobokanavaxe.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349e22a6316---3114524389.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/58961283397.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/80367618006.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/poduvate.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/lifofibubajafov.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/wofaxaxapejozaxa.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/73206663086.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614001ca30fb8---67923253422.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/dapit.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/5706297216.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/pumuzikuruf.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/sanexivedekeponav.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/wiboxalez.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/49580663423.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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF076 17872 bytes
SHA-256: da102e3997a1acb7df06385f671007305685f5357c76aa83fbc944eee0cc8404
font_02_sfnt_off00011ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECE 10940 bytes
SHA-256: 1c913d05cf135ad405178e99f4fcd90842b62e7652c814fda4b3110a541ac860