Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e7d43bf125e2010…

MALICIOUS

PDF

79.0 KB Created: 2021-10-06 04:55:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c5b8eb0aeb6789d5487dc81750d567a SHA-1: d8d754f265c06c3ec4f358dcea4da0eca5d4ee55 SHA-256: 7e7d43bf125e2010df08a011910b360c5011f99e7f50fc4142e05f775c0c72fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infrive.ru/uplcv?utm_term=the+great+reset PDF link annotation
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/bekalufigef.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/zilinewukibona.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/89035808730.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/lobakubow.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/94685016306.pdfIn PDF document text
    • http://yuhongzg.com/d/files/binezosoletatomimamelupi.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/61457823613.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/faxabekexakiwixetozepiv.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ce8b7403558ad8498be6ac6111930e74/36893637180.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/51963557094.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/soxepugepamowitir.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/27016078403.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/mapiladita.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/87997471805.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/11429105391.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/zuvebaduvataruwuv.pdfIn PDF document text
    • http://recviem.ru/img/upload/bofinezag.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/zomewudodiledi.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/sotafilamixebuzoditamiw.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/wisazigokimuliwexuwoder.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/97925233255.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/94056293842.pdfIn PDF document text
    • http://raovat.coi.vn/uploads/userfiles/file/51467174179.pdfIn PDF document text
    • 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_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 9988 bytes
SHA-256: 2e4f58fdeb24a1e70dc1b7d473e186c0f17035ecd9eb5cb4563bc360887e7e30
font_01_sfnt_off0000e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE694 18520 bytes
SHA-256: 7762f4be7662412bd0bd5cb242abf28f5659ab287e604df8129f72190ca7e7ba
font_02_sfnt_off000116d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1