Malicious PDF — malware analysis report

Static analysis result for SHA-256 da42608bbc58dbdd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 21:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5bf5b91146304b8a50e5a1a1302ef2c5 SHA-1: 901333c466f1525d030699aec949c90aeed0f82e SHA-256: da42608bbc58dbdd25f9bf31cc8fa12590c62d4bad96b97abd289e7ed2e32803
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://allytemp.ru/uplcv?utm_term=best+driving+simulation+games+for+android+free+download PDF link annotation
    • http://xinchenfast.com/upload/file/kuzipawuzunujekinesi.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/besiwuvepexugiwix.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/95557415984.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/68211133777.pdfIn PDF document text
    • http://youil.org/userData/board/file/93681483028.pdfIn PDF document text
    • http://phunggia.biz/userfiles/file/60192204174.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/36358315505.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/tusarebufominoxo.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/wajopitenezita.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/92310983057.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/15760046404.pdfIn PDF document text
    • http://airsoft1.ro/files/file/92887583458.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091308070269.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/kupimopad.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/12584838018.pdfIn PDF document text
    • http://knipia.com/userfiles/file/82462500855.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_off0000e1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DB 11000 bytes
SHA-256: 77249d23d12a29afb5d3b70b5269d3cd9af8977e1d95fa45671942763e382b2f
font_01_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 17524 bytes
SHA-256: 07da78429a39da37a872b5cb2be078210674006839a23f4ea600b3e1f0d37f2f
font_02_sfnt_off000128c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.