Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7d05a7b38de807…

MALICIOUS

PDF

81.5 KB Created: 2021-09-21 07:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a61f7abac860bfbe48bf08dcaa78f68a SHA-1: 7e7246f582d76c2dbe8d64c98ece86890bca366f SHA-256: 8b7d05a7b38de807f34b4d63163ef8095a75d6679c357831f67197cb971aee77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://archism.ru/uplcv?utm_term=tell+me+how+i+die+full+movie+online PDF link annotation
    • http://personnelstrategies.net/userfiles/file/11519448399.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/deveduvapokuxubew.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/65789364373.pdfIn PDF document text
    • http://unixsensor.com/uploads/files/202109200812527422.pdfIn PDF document text
    • http://houselandia.ru/files/tobidagimojojumifimujet.pdfIn PDF document text
    • http://jfe.hk/userfiles/44044259625.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/rozuxopenosapa.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/takezafasesun.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a8da1c40a---42388549844.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/81998023781.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/94087345983.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/molozakajowenezonon.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/48714978516.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jaxupabasunupelad.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210913115105_sbf64p.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/febewasav.pdfIn PDF document text
    • http://mgrima.com/files/file/27867175942.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/42016302c90432f50836382508b6bc42/mekawixurovi.pdfIn PDF document text
    • https://attack.lt/images/files/fizuvedavafevutoni.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613DFA7546BF8.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/23038093567.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/ligefixixopufos.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/94029617544.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/weganaromakutupogutare.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/3876697074.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210908_025242.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_off0000de60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 10304 bytes
SHA-256: 91c36d224d33a509d59e562a853562eeba91dcd56f8f6aee3d5afb613fe2db17
font_02_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 16596 bytes
SHA-256: c51151c610b78f9c318dd471af28265aa757c2dcb3e666fd196cb202a92e2929