Malicious PDF — malware analysis report

Static analysis result for SHA-256 641e56928ea2033e…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 12:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6a7de5405792b99af87098debc2f7224 SHA-1: 89bc9eb139d7762c7e687a23f7956e43294c42f2 SHA-256: 641e56928ea2033e34a3b8f02c9eec064b615be5deba4e2c1ec202591d04ae0f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

Heuristics 4

  • 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
  • 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://sabaispa.net/userfiles/file/dufur.pdf
    • https://ww150004.linebot.net/upfile/files/20210913054705.pdf
    • http://radio-salsa.fr/php/rs/filesupload/file/xetaxolasojaxafapize.pdf
    • https://indiansabroad.uk/userfiles/file/zarujifejefisuno.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17260238218.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/80221733335.pdf
    • http://siamsnail.com/media/userfiles/files/xifagewasafudemikopejav.pdf
    • https://kit-veron.my/ckfinder/userfiles/files/48901930066.pdf
    • http://fine-cottage.ru/userfiles/file/59667582108.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/00ba2c9b766e10b49db95c7ca2478948/45482565146.pdf
    • http://myarrahnu.com/mo_images/files/16210496768.pdf
    • http://electronicaindex.nl/images/uploads/30074583.pdf
    • http://nexxosrealty.com/userfiles/files/69511834377.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302947ce543---ludelatatave.pdf
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/fekuzujetibesefunibas.pdf
    • https://sistemagestiondpr.com/userfiles/file/96819861901.pdf
    • https://luiginoiobbi.com/userfiles/file/wavaxuxogosikijijewisojow.pdf
    • https://canevastoilestjean.com/upload/editor/file/50182418720.pdf
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/dumepalataz.pdf
    • https://nevjegyzek.eu/uploads/file/26010268546.pdf
    • http://timnhanhonline.vn/upload/files/49981814422.pdf
    • https://keralatemples.info/ckfinder/userfiles/files/majixojikemuzagobewawaxur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=mk+movie+2021
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e345.bin
c26ece12e198493da3ceb058582730e64e84077c57c2a84c80c69ca752c1aa5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE345 10036 bytes
font_01_sfnt_off0000f9ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AB 16792 bytes