Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed208e52df6d2a5…

MALICIOUS

PDF

93.9 KB Created: 2021-09-17 16:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc7c749379ecc59fb214c46fc7445cab SHA-1: 9548484300a7b64e4c7c1ecb32a01bd6dc6decb7 SHA-256: 0ed208e52df6d2a5a3f2d4c06d4373ffbd0353e33aab8370a68e2c0fcdfa3cfd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The presence of numerous external URIs, many of which are on disposable hosting and appear to be part of a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=kotlin+development+company PDF link annotation
    • https://kingyao.com/uploadfiles/files/20210901_174530_8987.pdfIn PDF document text
    • http://heizler.hu/files/file/11707824421.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/81647396047.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/17569280154.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/61328110883.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/biwaw.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/73843922567.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/raginasazabosufugov.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613130e01951a---wurev.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/26964792929.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/7134768033.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/84970575502.pdfIn PDF document text
    • https://duel.pl/userfiles/file/bixegeresig.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/jalibewalenid.pdfIn PDF document text
    • http://someteme.com/archivos/_20210908164819.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/68741058216.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/kirot.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613316f34b244---53160402697.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/76722973191.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/39508773328.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/82096455335.pdfIn PDF document text
    • http://art-ball.net/files/file/tofapenasedulaw.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/42677567890.pdfIn PDF document text
    • https://onlinendttraining.net/files/lifekuri.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/sakupom.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_off00010911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10911 18776 bytes
SHA-256: c0196339e366c9615617d926bbb7dbb0ff407e5b104ef7b5cf8d8ce0d318bb8e
font_01_sfnt_off000139cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139CF 10580 bytes
SHA-256: 74c52d014e7e5cf7b4188ff0c42768ed02aa975c5f152a4b01da406c527c07e3
font_02_sfnt_off000151ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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