Malicious PDF — malware analysis report

Static analysis result for SHA-256 a988a097ec89c867…

MALICIOUS

PDF

89.5 KB Created: 2021-09-15 22:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 690c8a62e242ea747da921f2f1453708 SHA-1: 792de93cc9aac4aba3dcf362d8639da9a58154bf SHA-256: a988a097ec89c86784201b1a591bef29b8f17d394e61681a28a05d7e65046f34
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=combustion+chemical+reaction+equation PDF link annotation
    • http://a-aqua.fr/ressource/site-image/files/fabumegegerilitipeda.pdfIn PDF document text
    • https://revive.fashion/upload/files/13572479566.pdfIn PDF document text
    • https://gogreenonline.net/userfiles/image/fckeditor/file/vezonazofagazagefalasaz.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/nopivonojumunepejomozido.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vikatasuzosotixusiwit.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/jaxojow.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/kawogikexusekoxamisejewib.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/suleju.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/9602932332.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b78e5373d1---33407842981.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/85972372327.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/51564811984.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/simego.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613775784ff4f---91988161562.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/jujerejazubisupajijaf.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/84967019169.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/20875295550.pdfIn PDF document text
    • https://krusomying.com/data/file/mufagosirosowusopagufuj.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/jenutibomanuf.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/ximugina.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/sugavuwofolawetetur.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/jaroxiwirofiduk.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/39713603871.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/fiporazemidipamata.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109122029146315.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_off0000f1ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 20112 bytes
SHA-256: 13f1d1e930772f74c1fbfc94bc7aaa56c85d5b92cf12205cdc96b11fc8c3d637
font_02_sfnt_off00013f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1C 10912 bytes
SHA-256: a1d682bbf8708259ebf6d1f5bbd6ed187f21bc740ebf748ea9d00371876d7d94