Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee50ec31781c246a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 03:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47b7b7fad7ab4517d633a648727c84d3 SHA-1: cff26cd6521bb87cf94d6df5bde8d1a0d9af8659 SHA-256: ee50ec31781c246acc09abb33a0494c4e2fd4851ee157bcce771070d8bb45af5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://crysiq.ru/uplcv?utm_term=template+ppt+smartphone PDF link annotation
    • http://kingbikeonline.com/images/upload/File/tunupokabuvef.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/55057020840.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15aee9a5a---gitasebilunedow.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/63635487240.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/6933820013.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210911_09317E1C3EFDB6A8.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/gumikekokurikutika.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6b8b687fd---92829546550.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/tolefipisetinafokona.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/93675932970.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/99997226289.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/petewi.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/bokaduzexufi.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/54030686402.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132f569316ff---gunabe.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/90592647127.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/13031801175.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/motozexakuwireziro.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/53654080239.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/wobereseroxixolume.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/70238829204.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/80490062464.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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 16508 bytes
SHA-256: c1073db4f2744644123d36953f67586c4f714c1f12b57c216a6365999a62839e
font_01_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11020 10388 bytes
SHA-256: 2aa752d3c86348033232575db02bfbee05ce90a10bf9e4a6aeda6fbb2188bf24

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