Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5bfc493c31dc3c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 21:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 113622fce92c29f9687d61e5d1144b7b SHA-1: bb3185a9d7e69e90a9a6b42a7c0b31cf78b7b2f3 SHA-256: 6e5bfc493c31dc3c2d459bd649e787b15d5981b8678e8411aea458f6a593aea9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to disposable domains, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://zagorjeadventureteam.hr/files/56163171938.pdf In PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/32136482828.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/zatujapav.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/68465605243.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7014131432.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/buwamulupiliworomet.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/13202899233.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/79618544591.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/65222869977.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/22010643666.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/wikavez.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/68993957526.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/72489320611.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/dazurogawasitalop.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/kepijinuxejaw.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/ladozitabajix.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/vefabuzonopites.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/kawujigevarosawe.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/19220569563.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/morewelotenuberenoxikob.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/26044852.pdfIn PDF document text
    • http://e-sheremet.com/img/zujigidisakatipikuxi.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sotetokadodab.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613002f7c05ec---sulofi.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/2021921544589535.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161307419bdc93---pewefizaresovesiraxopisor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=omegle+mobile+downloadPDF 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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 17116 bytes
SHA-256: 0a09aabcbcc988c5fac3b41058b874ff03f3eb1a61d5141a9f9db18f790c1511
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 10476 bytes
SHA-256: 7cdc12d85b27272b246993ec27a913af3995ce67aea13c52a3360208c9bb0d7a