Malicious PDF — malware analysis report

Static analysis result for SHA-256 943e88f2b0b4fd64…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 09:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 457b2a22285300b3eb179be47b00652a SHA-1: 86cbb2766b2cd10680a84943cc0dda0d2d9cf42b SHA-256: 943e88f2b0b4fd64d5ee50b32d9042b39f76af310fce246182742dbcc4145729
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV with a signature indicating it is a phishing trojan. Static analysis revealed numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The PDF document itself appears to be malformed or obfuscated, with no readable content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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://allytemp.ru/uplcv?utm_term=come+pulire+cache+android PDF link annotation
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/30335815585.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-6/20210906072710690553.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/bopovoras.pdfIn PDF document text
    • https://sokole-tps.pl/userfiles/file/49528926964.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/benutivegigisasitiwemogor.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/tabepibisurujoxizavoze.pdfIn PDF document text
    • http://lemma-studio.pl/userfiles/file/69713725317.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/liziguxipajufuk.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/15765034457.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/vumetagenotasovofez.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/modamigorawu.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/dumesafoxevavetorokalo.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/pasipodonuful.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109020505029987.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/19196029307.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/189768898.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7415f26a0cf56b13391bbb7b6aafba8b/rixafi.pdfIn PDF document text
    • https://breedlife.com/upload/files/vunogexobelaxerop.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/xakigovabexiv.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/3723661087.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/47938936603.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109072309182435.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A41 10644 bytes
SHA-256: 2a673c1bc21e33efcbb970ae7f1cc3589f7972301f02e4862faedfa74b008ced

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