Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56b9501fb308e1f…

MALICIOUS

PDF

62.5 KB Created: 2021-09-28 00:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1832005195d42b2abc1c6da5e9fd8fe SHA-1: 0dc60e683437b3fcc878f832735d8c22b3802a1f SHA-256: b56b9501fb308e1fd6b3544e1a77e14acdaa7c65779dcd4d1e3892d313e20880
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of numerous external links, many pointing to unknown domains, suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ML classifier also flagged the PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5277

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://av72-reklama.ru/userfiles/file/1632320172c6b182d0f041a2312947.pdf
    • http://intertribo.sk/files/40357359347.pdf
    • http://hibertek.com/image/files/20210922_085235.pdf
    • http://pantipplaza.com/userfiles/file/12224403900.pdf
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jokametotesefavofipopi.pdf
    • http://ljjxmining.com/uploadfile/file///2021092618092756.pdf
    • http://baigeleather.com/userfiles/file/52556030532.pdf
    • http://jevades.com/aircraft/fckimages/file/74542102906.pdf
    • http://domuran.pl/files/file/rason.pdf
    • https://psihodesk.ro/ckfinder/userfiles/files/puzigasugo.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c904317c25bba35e5a1f98261d1cb2f1/27652788933.pdf
    • https://stcc-sa.com/motakamel/Ups/files/razamomejawodezotukip.pdf
    • http://mixline.ru/img/lib/file/688255635.pdf
    • http://bankerz.in/qpic/files/83147945486.pdf
    • http://kuhomania.ru/ckfinder/userfiles/files/36907829798.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/vemigesevopatoxugijeliral.pdf
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19004518664.pdf
    • https://u-spot.biz/js/ckfinder/userfiles/files/lizukixumezofu.pdf
    • http://nonstopsushi.com/uploads/files/bokikutasurixemigex.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/95009802509.pdf
    • http://brmhn.com/userfiles/file/20210916205149_m3igve.pdf
    • http://sichera.eu/userfiles/files/jebukenilatimafepo.pdf
    • https://muzpony.de/obrazki/file/tuweruboxo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=do+androids+dream+of+electric+sheep+epub+download
    • 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_off0000ae32.bin
2013427184d264eadef4be5f7247251a2eafc33cd087487200663e841b910dff
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE32 11212 bytes
font_01_sfnt_off0000c80a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 16792 bytes