Malicious PDF — malware analysis report

Static analysis result for SHA-256 158c1477f7df2384…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 08:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fa668dc73cbaaef8a9fd82939ec94c0 SHA-1: 21576b2ce0579264089a47658654360b21094858 SHA-256: 158c1477f7df23844cbd2262d2af4726b41886347f7e3e253a3851960ccafba3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8805

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://oniceh.ru/uplcv?utm_term=new+ma+chele+bangla+choti
    • http://scarpatti.com/files/4224975377.pdf
    • http://teleinwestor.com/userfiles/file/51230714780.pdf
    • http://shortguycentral.com/ck_uploads/files/xobeka.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_20_13_32_29_1418.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/wasivusujejumeliti.pdf
    • http://forestheightsgarden.com/ckupload/files/79969536508.pdf
    • https://motodubai.com/uploaded_images/files/gisikigokimofexedasosogex.pdf
    • http://placidlakes.com/larpm/uploads/file/ruworujuxaz.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/76688587341.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c9c2aa240acb4073b47e884c69aae623/zisebilonivilibuzakudo.pdf
    • https://mancomunidadvaldizarbe.com/userfiles/files/57780995879.pdf
    • http://www.lircai.com/web/inline/file/84877791547.pdf
    • http://gptools.net/userfiles/file/58652476447.pdf
    • http://chanhungcorp.com/images/uploads/files/noduvaxesifavowutide.pdf
    • https://www.bosingels.nl/ckfinder/userfiles/files/33733366676.pdf
    • http://lignumweb.com/site/webroot/uploads/files/luneb.pdf
    • http://thegioioto.store/upload/files/58150995010.pdf
    • http://kvbm.org/pds/userfiles/files/fefumokavoligutek.pdf
    • http://indianspringhomes.com/userfiles/files/ribevu.pdf
    • http://cctsw.net/whly/up_files/FCK/file/20210907_165551_116.pdf
    • http://pdww.ru/ckfinder/userfiles/files/latiwuxutumejovufutitam.pdf
    • http://dailygameresult.com/editor/UserFiles2/files/90568014006.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d828.bin
987c73a44c80d826eb6cb0295dd142a16f05e8c7eb082af275e4aaf1ba2227b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD828 10612 bytes
font_01_sfnt_off0000f041.bin
8cab044fd84f357fcc31c080969febdc98c28b781b6afd1587f89bfdb9cb0677		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 16668 bytes
font_02_sfnt_off000107f2.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 1680 bytes
font_03_sfnt_off00010fea.bin
71257901c0801ab3e35c5605620d051f678d0c08bd76ef307e64bce51a1f5549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEA 25068 bytes

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