Malicious PDF — malware analysis report

Static analysis result for SHA-256 884e596f2c1ca4e7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-20 22:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a6754ba67302fcafade6712372cf088c SHA-1: c00e5361ed66ee4fe3b495bea9c04eeed7cc0280 SHA-256: 884e596f2c1ca4e77a8c2dde309a0a80c8c2ccc823ba83dc34265a08cd1b447a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, which is indicative of malicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a phishing or redirection scheme leveraging numerous links on disposable hosting. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://seteo-dechets.com/images/file/84755296171.pdf In PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/12388183760.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/punenoxagowumonuseriwoxij.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f898a7c42a---kirajubelatimejog.pdfIn PDF document text
    • http://vpsystem.com/files/fck/54421325142.pdfIn PDF document text
    • http://djpress.pl/Image/files/duxekokajexinobupepivo.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/vovokawuguminegelizoxin.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/pidikezosejur.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/semefim.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/sowimejesagaserowixotu.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/71345371704.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zaniwovebukujevux.pdfIn PDF document text
    • http://gaudi.tw/upload/files/5482686555.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/xasufemulumapotimaxofore.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcaf64210f---weriwiruvajajovuburi.pdfPDF link annotation
    • https://theelementrama9.com/userfiles/files/88375954051.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/95546917832.pdfIn PDF document text
    • http://lukinserv.hu/file/gadaloz.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/wedobaxu.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/3121120182.pdfIn PDF document text
    • http://crm333.com/documentos/file/18233561792.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/73577776574.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wps+wpa+tester+apk+for+pcPDF link annotation
    • 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_off0000d59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59A 17920 bytes
SHA-256: 200966b1948a26624a0a944e50ff9204b5f6d4c8e8e87e995aadd437f4a25c83
font_01_sfnt_off000103e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFF 10404 bytes
SHA-256: 36ccaf0b1bb668135680614a0558febfde4db4f635d56c274dec2e334c6325d0