Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f590e7a90b692d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-18 23:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9ee336393b1a33938e3f5c642e6b901f SHA-1: 0cea6f78cf94ecb5944cbf05791be83bf9666272 SHA-256: 78f590e7a90b692d736c7ce6b42b647a8509130cc82c8eb03dc7fe7c54fe8a5f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the high ML score strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest the PDF is used to redirect users to potentially malicious websites, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://catamma.ru/uplcv?utm_term=android+app+icon+pack PDF link annotation
    • http://ourconn.com/userfiles/file/202109011803499224.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109091804383695.pdfIn PDF document text
    • https://norservis.cz/files/files/27709461992.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/46970519499.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/gobavafag.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/31382575949.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16143326b1c07c---nalilerawopidivagitufego.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/rumazotoxozikosiki.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/33946689947.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428a06add34---dekutimu.pdfIn PDF document text
    • https://j26clean.com/upload/files/resexikuxobi.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/famusisavogoramuso.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/23693324364.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/wupoxugozufinu.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nalasagetofofopeturodi.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/bifilonipoketelag.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/37836273224.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/kadesalodanamupulinurigix.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/18854204806.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/bupiroxenota.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/kozejudowo.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/wujib.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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DC 10136 bytes
SHA-256: 1947926a6f3ca2081f3e717f10943c736f4fcfe1bc8dbb5258bd5cd45451e05a
font_02_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 18252 bytes
SHA-256: 0bb18eb0f963835f18d3a095881b1dc31f9e23055e239b6b5a0e9564f351ea24

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