Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb36d68742d9c5c2…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 13:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1afdabea1f856b2e2f00b7f84ffab7b8 SHA-1: 25eb3fd95e4bf46c6ce4fe16eb9c4404d3043581 SHA-256: eb36d68742d9c5c23b58ebf2ea8b7c2d25b9e86da976ab3df1b18fee1cbf56ab
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 https://wic-net.com/userfiles/file/70344122161.pdf
    • https://nhahangthanghuong.com/uploads/files/vivelifupesujevumivinev.pdf
    • http://luisacortesearchitetto.it/userfiles/files/tolomakukizune.pdf
    • http://ltptech.vn/uploads/userfiles/file/42975023505.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9c5877f13ae10a783ce69002e2808622/vijud.pdf
    • http://ekstelekom.com/userfiles/file/59772878649.pdf
    • http://villa-margherita.biz/userfiles/files/jotitaduvagederevox.pdf
    • http://seoaudytor.pl/userfiles/file/26274046760.pdf
    • https://edubox.mn/uploads/users/0/files/todetuwutava.pdf
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/17940930310.pdf
    • https://betalinktech.com/blmedia/file/99925440979.pdf
    • http://kunjipsc.com/uploads/files/37459615588.pdf
    • http://sino-web.net/filespath/files/20210909015220.pdf
    • http://gyndoktors.de/ckfinder/userfiles/files/pazob.pdf
    • https://ngonluathan.vn/images/ckeditor/files/femanoratunajosotifitod.pdf
    • http://homearcky.nl/userfiles/file/wutaguvalumusedavazop.pdf
    • https://labelmarket.pl/data/file/danitumedukagalotidatepit.pdf
    • http://travelport.pl/userfiles/file/gelomagativipuxadamud.pdf
    • https://emmaushuis.org/pages/wavisenexalazafes.pdf
    • https://xn--80aesyq.xn--p1ai/files/file/vupaxategax.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a34aea2d8---99597796181.pdf
    • http://bjyhyy.cn/filespath/files/20210914095102.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+access+sim+card+contacts+on+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_off0000e2c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C9 16792 bytes
font_01_sfnt_off0000fadb.bin
1c60744500c2edd4b6c85f0459dd3a20187653153d121d4d8bc6070b7d69df50
pdf-font-stream PDF embedded font (sfnt) at offset 0xFADB 17736 bytes