Malicious PDF — malware analysis report

Static analysis result for SHA-256 6611cf0df813e6bb…

MALICIOUS

PDF

74.8 KB Created: 2021-09-21 00:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6052201b5341655b7539268819b32ba0 SHA-1: 5b998e68a97fea72176cb6e14ddd3cd426106409 SHA-256: 6611cf0df813e6bb934020c80641a0be87a5822d62b3128ce3cc0f8d3944b28f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, identified as a link farm by heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • 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 http://ketoanantamhcm.com/uploads/files/86195298747.pdf In PDF document text
    • https://ever.dacola.com/upload/files/pokutexexunofibetugozoz.pdfIn PDF document text
    • http://ibb-online.ru/f/file/niwanozekotedumonekujukes.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/todunafojugi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/xibiz.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/gezuxufepedumep.pdfIn PDF document text
    • http://bptramptour.pl/files/file/taboxaxididemeka.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/14902164989.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/risatoxifun.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/xotogigitef.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/25950308643.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fnjdrmfi3q76g99filhoa0ha56/77299889335.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/42442122645.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/25875098517.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210919171929.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/wofupagukavemilose.pdfIn PDF document text
    • http://373113.linker.tw/files/16904106541.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/1250296811.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/pugososowazojali.pdfIn PDF document text
    • http://texmet.pl/userimages/file/77790112458.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/86564740543.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/xejadomeroxodu.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/17588193090.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/87166256900.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/5cead8337f4371d489a7d644dbd8306e/vuvezuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=first+android+in+indiaPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC227 17264 bytes
SHA-256: 9167ec8ad55e43f34f2a4cb8a146998a0b41ff2c6ca205f30c02c51c87d02ccb
font_01_sfnt_off0000eeff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10040 bytes
SHA-256: 718cbadaae1b1e958142d633ee5780c599dcc6eae6cb46f8d2081591e1eb6f3a