Malicious PDF — malware analysis report

Static analysis result for SHA-256 0359270dd6c6481a…

MALICIOUS

PDF

107.4 KB Created: 2021-09-09 19:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a93c903c9e4bab0666df923448a5aea5 SHA-1: 21954d820954a3e70ddb5e48ff15b55d5ee5afff SHA-256: 0359270dd6c6481a31a96c68c1ca841120ef565de42c6a8205c2573c16ead81f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The embedded JavaScript is likely used to obfuscate the malicious links or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9807

Heuristics 6

  • 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
  • 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://coretry.ru/uplcv?utm_term=less+than+zero+book+pdf
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/bukevusixabefunakux.pdf
    • https://leanuslab.com/UserFiles/file/nimexiz.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/jepopunipipetewabatapaji.pdf
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/65716889118.pdf
    • https://mimpi1pusat.com/contents/files/berebelukadofuzidigo.pdf
    • https://artcorner-fiberglass.com/userfiles/files/5995053116.pdf
    • http://ladyqueen.it/userfiles/files/jewovofejikavuxaven.pdf
    • http://noclegsosnowiec.pl/eurostyl/photos/file/30232176279.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/3262497a4e781c58a06c6ec90a0ceece/29750823884.pdf
    • http://bnblspecialities.com/userfiles/files/81761522851.pdf
    • https://silky.ae/images/bulk_images/files/96582976624.pdf
    • http://topstec.com/d/files/pitoxepakerilovuxixure.pdf
    • http://www.kingsmen-cmti.com/upload/files/80526884243.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210908_3D456E008C588E60.pdf
    • http://spakimthi.com/upload/files/wusenodopivupasogo.pdf
    • https://pmcp-avac.com/files/upload-ckfinder/files/vuzilusewazufakewasora.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/21579270474.pdf
    • http://innotack.com/userfiles/files/5103467376.pdf
    • https://robustbrakes.com/administrator/imagetemp/file/17031862310.pdf
    • http://solmoda.it/userfiles/files/gezuxitudazexifojofes.pdf
    • http://burattinojatek.hu/userfiles/file/20660600174.pdf
    • http://hferrynetworks.com/FileData/ckfinder/files/20210904_F471BA608508526E.pdf
    • https://kolbandibileklik.com/resimler/files/29805321580.pdf
    • http://chetaomaynganhnhua.com/uploads/files/rivewi.pdf
    • http://constantemail.com/userfiles/file/1630776263kosoferemidex.pdf
    • http://konikanarrowfab.com/ckfinder/userfiles/files/jununumavug.pdf
    • https://motodubai.com/uploaded_images/files/ragusimija.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF1 16792 bytes
font_01_sfnt_off00015403.bin
631147ecc283d548f2079a4d42aee4be7fa14f79e9ad8b04aca2fa543f962a87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15403 19712 bytes
font_02_sfnt_off000187da.bin
d7296512dc40acad12a8abc56d6697b859314a481922778116696e596fdb174e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x187DA 10704 bytes

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