Malicious PDF — malware analysis report

Static analysis result for SHA-256 89105166ba8bfe1e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 10:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f22371887171df7c8b4725111e1b048c SHA-1: cbb503f2a87efb83122275dd492b040731370856 SHA-256: 89105166ba8bfe1ed8dc1e2b3df7807069bee013e1803285036b1762e893d7a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains a large number of embedded URLs, many of which point to disposable domains or are used in a link farm configuration, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=zee+tamil+sunday+program+list PDF link annotation
    • http://kossuthdigisuli.hu/userfiles/file/wefopomam.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/5655816085.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/devuxosiwaxum.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/85698653592.pdfIn PDF document text
    • http://progetec.org/userfiles/files/32256787844.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/58226184589.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/76723090125.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/nixemesemuxovuvexukaxir.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/xurojifodusesu.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc6619f0c---duximawimogukoguxox.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/73455072565.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/mibatuxomixe.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/88733795706.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/84623393575.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/fewaneripudufegep.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/51774291610.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_off0000db85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB85 10912 bytes
SHA-256: 9194fa48ae03d5b4346d5c751f9833f1bc5fc11c9dfd201d539f1485f8be4295
font_01_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16908 bytes
SHA-256: 568cc4457395022b02b8d912a7ef57332e7649ef72c1a16eb64229133b8c10c9
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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