Malicious PDF — malware analysis report

Static analysis result for SHA-256 013378acfbe0778b…

MALICIOUS

PDF

74.6 KB Created: 2021-09-18 15:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf6cb5acfbe723be8e43a6459f038425 SHA-1: db56dac5fc232d3a6e025e045a713cca471246b2 SHA-256: 013378acfbe0778b70e4ee50dae6d608c6648ab927492d3d489a1d80170eca33
126 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as 'Pdf.Phishing.Trojan'. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://chogmai.org/ckfinder/userfiles/files/4304719876.pdf In PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/3192638286.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/49168226490.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/96961067832.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/38544347151.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/61074945276.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021090716310157269.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6ec289a97---83404180439.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/52553853670.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_15_14_45_49_5662.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/22363157961.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9b8ccc9d---tuzomikur.pdfIn PDF document text
    • http://home-plast.ru/foto/files/29464838782.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/resudavomadubij.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/56640475247.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/53167492872.pdfIn PDF document text
    • https://unaizahic.com/Files/files/4368884794.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/jepolojimafupiba.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/tajojilariw.pdfIn PDF document text
    • https://baglab.pl/galeria/file/76219629779.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/43955722721.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/78808500239.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/mizusirezisiwigesumeramaj.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/85518483871.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/67157408926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=8+ball+pool+aim+hack+download+apkPDF 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_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 16076 bytes
SHA-256: 732adbd51c69af8acd668674a4a8ad096e8805c5a645a24c4e4d1a3906590340
font_01_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 10712 bytes
SHA-256: 9d5b462b787d050eaa84192b7a3033fa14ff2a472f0b8608724015e5c712d685
font_02_sfnt_off000104c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1