Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e6b2cf91e604992…

MALICIOUS

PDF

86.3 KB Created: 2021-09-19 00:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 20b4456e9fcc699b0719c16a36d3842e SHA-1: 79eb4d6518803f8fae0de8bee6b59e2a0b3d12d0 SHA-256: 5e6b2cf91e60499286a5e567e8811f5cdfae9e6a44bd83b26c57a57f580c387c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://ozhelalikram.de/resimler/files/54501053393.pdf In PDF document text
    • http://leruichem.com/upload/files/37609225434.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1630782424.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/37275018522.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/jomufikevurenovi.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3e181826---310875018.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/83118544968.pdfIn PDF document text
    • http://holzbau-napetschnig.at/46663123626.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/51362687087.pdfIn PDF document text
    • http://101balkon.ru/upload/files/puxegasedojusuxuxos.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/57626192068.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/koxabanepasebezegobimu.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/jefakawuw.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/50315195845.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/mopapefajifuxagevuk.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/10773652897.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/korusijowibivoduxot.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/25744659494.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210919_FDF748E5C0D345D9.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/lijaninuwurukamuvafabatig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cool+hacks+in+minecraftPDF link annotation
    • 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_off0000edd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD7 17372 bytes
SHA-256: 6afc0c5b45c318a2aca307d1be53e394274fe593618d6f45a7b4be145be70719
font_01_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001330e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1330E 10724 bytes
SHA-256: 4760bd084e2763ca3c31d2bf55f7c040be69b952063ef1cde184eb154a82884f

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