Malicious PDF — malware analysis report

Static analysis result for SHA-256 773fc6dd16a65d1e…

MALICIOUS

PDF

96.1 KB Created: 2021-09-19 03:58:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a517800595e59091e8c746d0658b8b73 SHA-1: 72e1c56c07d8a88d2f3e7227d9ebbb0d3db586de SHA-256: 773fc6dd16a65d1e61f674abc0819f8c8fd3de8c2c1580e59b663a0920e90a2a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. It also features a high number of external URIs, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://konferencii.ru/js/ckfinder/userfiles/files/1266157282.pdf
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/nogog.pdf
    • https://namkhoasaigon.vn/web/images/files/girenodisumenez.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/14110762628.pdf
    • http://bojovesporty.cz/userfiles/file/zivelowafakefane.pdf
    • https://organicfertilizerproduction.com/d/files/bezalalazenof.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/87061768098.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/vukefedemumevu.pdf
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/voboxedojujazigoravu.pdf
    • https://okud-istra.hr/userfiles/file/dabaxigexokisateter.pdf
    • https://mabuksusu2.com/contents/files/vezisowo.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-9-12/20210912212844584342.pdf
    • http://suncitygroup.ir/basefile/suncitygroupir/files/74792295579.pdf
    • http://www.contal-farmer.com/uploads/files/kajebexafuwerifek.pdf
    • http://tokyosushilohaus.com/uploads/files/24482791772.pdf
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/17636359000.pdf
    • http://maximaviajes.com/FCKfiles/file/timukip.pdf
    • http://bulmarconsult.com/files/vipevojotokujo.pdf
    • https://globalathena.com/ckfinder/userfiles/files/25693350508.pdf
    • http://pomocnaukowa.net/Upload/file/45357355913.pdf
    • https://leciv.fr/uploads/FCK_files/file/46757492042.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=general+principles+of+commercial+law+7th+edition+pdf+free+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001121e.bin
9e8690a167aa719eb52a359aecde7bd762e37b21fd851ea306f6f169a1c71e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1121E 17916 bytes
font_01_sfnt_off00014072.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14072 16792 bytes
font_02_sfnt_off00015889.bin
067c24b120be0004f932d1fc844bf27c5491dcfeba22ddbc05b5075a14ebef01		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15889 11060 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.