Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ddb23d4db85492…

MALICIOUS

PDF

67.7 KB Created: 2021-09-25 21:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e2f606aee49dd9f7bb0b880f62b8e34a SHA-1: 0b7a7a2dcefcb503a4a48d2de179d6e9ff3bff42 SHA-256: 39ddb23d4db8549220eae1ca5d92ab90b7c9deebae08f546478ad613d40c25a4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs pointing to various domains, many of which are likely disposable or used for link farming, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the sheer volume of suspicious URLs points to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=latest+movie+download+site PDF link annotation
    • https://markmont.eu/editor_uploads/system/files/rigigaduwomowikinisobiku.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/789235489.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/powokazudarogapesosusuf.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/10877531509.pdfIn PDF document text
    • http://budget-pl.com/ckfinder/userfiles/files/dabuwufegipifutiki.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/88136135665.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/nekadaxejigifi.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/32842478759.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/monekurofotiz.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/xuzutudimukibegug.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/21063769648.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/16723427371.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/91b44c0d9c384b514046c03d4583ec7c/98935933003.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109230902062178.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/dppbl7j58b5voddv8fjrogblto/3983294214.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/9801357602.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/garani.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/64993977945.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/tufadegidebibabinugozu.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/pawarefisimexotet.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/56856624073.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_off0000abb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB4 10416 bytes
SHA-256: 2f13be60afd17711d099e011a4c1d6580c376cabd44cd121a173a8992985def2
font_01_sfnt_off0000c358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC358 15124 bytes
SHA-256: e68d457a692e01812bc9c1bd2e2c0a8fc5db6c20b9c915ed567de05abc75bc33
font_02_sfnt_off0000e9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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