Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd62af46f3ca3f3e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-09 04:26:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ffd9bb978bf01fc5089534e213496d3 SHA-1: 4413bfdff5d84d1d745b0eb609ade48827aeeaf3 SHA-256: cd62af46f3ca3f3e7e5b231f13e0e13e4e523ac38014b253a43035f83765d57c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with a critical heuristic firing for PDF_JS indicating embedded JavaScript. This JavaScript is likely responsible for redirecting the user to external URLs, as evidenced by multiple PDF_URI firings pointing to various domains. The presence of embedded JavaScript and external URLs strongly suggests an attack pattern involving phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=start+with+why+simon+sinek+pdf+download PDF link annotation
    • http://ancient-theater.gr/media/file/tinugunile.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/87843421796.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/71981875898.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/fumezitoxidadijije.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/54193826408.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/66731656257.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/61217676489.pdfIn PDF document text
    • https://premium-house.uz/images/file/29378898621.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/9801702756.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vojarifi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613577d3b44d1---gafeduviwivefexagijen.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/lurivejeregifawumilujo.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/43975823525.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/88917603758.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/doripujuzogebox.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/kogitatumofofawi.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/5b09e2238f05aed62155e44b6e082789/27245024567.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/pinogajalesufunibariti.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/70288744606.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/99223118849.pdfIn PDF document text
    • http://gazetavk.ru/img/file/safifepizesiri.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/goxedubotedekaxerapokes.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_off0000cb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B6 11132 bytes
SHA-256: d533053e89b5596550578ec551bb8acdf61fa69bc20a0f3cd68ce5c7a44f4047
font_02_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 17812 bytes
SHA-256: 631bc96ba98229e0538037799ae88a112bd4c605c69def480fd3a9585a6a2d20

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