Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa4e3b7a8799650…

MALICIOUS

PDF

72.0 KB Created: 2021-09-24 14:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4499514b15e8a150fee94ca647bd83ee SHA-1: 26e33ebef360d2fdbeed4db2746e904b9e8ce3f2 SHA-256: 2aa4e3b7a8799650b393efee7d921ba257989df7a0e5515d315b12b6cdb34ce9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to distinct domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature, likely serving as a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5903

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://market-oborudovanie.ru/upload/file/40514840474.pdf
    • http://skkl.cn/filespath/files/20210906101810.pdf
    • http://polipadel.com/userfiles/file/ralapewesevajivu.pdf
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/gegobuwuw.pdf
    • http://domuran.pl/files/file/72998389383.pdf
    • https://lotte-ppta.net/beta/assets/file/vofigusin.pdf
    • http://domusanna.it/userfiles/files/82013700299.pdf
    • http://wamer.org/userfiles/file/42124643218.pdf
    • https://leifs-auto.dk/images/file/51040519571.pdf
    • https://sankaibearing.com/userfiles/files/85119966297.pdf
    • https://hotelexpert.ro/uploads/files/vupupukuxilifopelepekune.pdf
    • https://harkakotony.hu/UserFiles/file/15243289107.pdf
    • http://manegedebuitenwijck.nl/uploads/file/rigagupubesogixirujipixip.pdf
    • http://www.physedu.in/newsite/userfiles/files/9319380231.pdf
    • http://optimaglobal.net/ckupload/files/82529016795.pdf
    • https://anitacalderon.com/ckfinder/userfiles/files/tabododexuninagaje.pdf
    • http://fizjoactiv.eu/Upload/file/93267858688.pdf
    • http://quantri.thaisonpalacehotel.com/upload/files/20575179112.pdf
    • https://dwitunggaljaya.com/sitefiles/file/47529626022.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/zibobof.pdf
    • http://castel.lu/userfiles/files/43278927246.pdf
    • http://birnagarcollege.in/userfiles/file/422697868.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=internetov%C3%BD+prohl%C3%AD%C5%BEe%C4%8D+pro+android
    • 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_off0000d437.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD437 16792 bytes
font_01_sfnt_off0000ec4e.bin
65bb093341e14a8f6dd03e9553b8610ddeac7b4c36637c95e7e11284ea7b5778
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 10768 bytes