Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca26411aa9d73122…

MALICIOUS

PDF

81.0 KB Created: 2021-10-05 11:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5404acac44e5c8ea140c8558ab34215e SHA-1: 7408759cb04ecc1495afae46b6ac949bd20ad3ef SHA-256: ca26411aa9d7312258a4754bbe6fa7b611fa982cc4d1fb68b819c6bc4ec98b60
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=hyper+acidity+and+gas PDF link annotation
    • http://rulife.ru/ckfinder/userfiles/files/lexibirutovaxizebet.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/jibixelasenubebowa.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/95959300905.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161408b9b3116c---lugasexekomag.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/58436820747.pdfIn PDF document text
    • https://aokman-drive.com/d/files/90092308128.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/fizirubejomolaxoge.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c63fd214a28620e3dac38b421ce77e8c/33152433499.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/76292820979.pdfIn PDF document text
    • https://marblobath.marblobaths.ph/app/webroot/img/files/99406197532.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/48760252360.pdfIn PDF document text
    • http://effekt-film.de/files/file/73122153128.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/nowitovotajenelenawozex.pdfIn PDF document text
    • http://vaithun.net/upload/files/wewesazokuxemulagi.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/55756129847.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/19374333734.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/59582228003.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/14499171119.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/6626357384.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/26737998649.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/22849402073.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/vezasizerupadupugibukose.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/31613640832.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_off0000d883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD883 10628 bytes
SHA-256: 75289c47482b19867304eca2c48659acc540e8e21fe7d0ed2d09c65345f3b56a
font_01_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 17632 bytes
SHA-256: dec1718ca0ba93c18acb5d5aac1bf9e2d0e5612bc1e58a72b209137e559ebdda
font_02_sfnt_off00011e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1