Malicious PDF — malware analysis report

Static analysis result for SHA-256 3543f7725c220086…

MALICIOUS

PDF

75.0 KB Created: 2021-03-13 18:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2179d3a4dd168ff28c9c35c6babb8eb6 SHA-1: a56df2ec3a550c11f3120e9df7e067eb0746df9b SHA-256: 3543f7725c220086d0a629238e2b7b3c397c74ff7441b375ce74f8189ce9383f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary external URI pointing to 'https://golowaki.ru/award?keyword=camera+scanner+to+pdf+download', suggesting a lure for users seeking a PDF converter. The presence of multiple disposable domains and link farms further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/award?keyword=camera+scanner+to+pdf+download PDF link annotation
    • http://nedavupagisezim.mygamesonline.org/35725978881.pdfIn PDF document text
    • https://bedaruwi.weebly.com/uploads/1/3/5/3/135326402/05c71c4e387.pdfIn PDF document text
    • http://kavakedego.scienceontheweb.net/tomepifi.pdfIn PDF document text
    • http://jenenirefu.iblogger.org/ejercicios_de_soluciones_molares_resueltos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378410/normal_5fc6c7c91a967.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_60467a4bcd0d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_6038390526f86.pdfIn PDF document text
    • https://pikarazumubujon.weebly.com/uploads/1/3/1/4/131452816/wolivexu-jodujujud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446158/normal_5fc96eac3ebdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413982/normal_601b5f3801049.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497666/normal_600a0833bfa70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455890/normal_60466aab67be4.pdfIn PDF document text
    • https://bomexufimewaw.weebly.com/uploads/1/3/4/5/134517434/cf21483dcb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiwozoget.atwebpages.com/waxizuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/291bd679-26af-4e10-baae-b8f02d740955/spanning_tree_protocol_stp_provides_protection_against.pdfIn PDF document text
    • http://tenezozujilajiw.rf.gd/24794522081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f544b572-faf5-4457-be28-472bf11c7908/57602824882.pdfIn PDF document text
    • http://lumugexov.rf.gd/theories_of_public_administration_and_management.pdfIn PDF document text
    • http://mijovutotukedes.onlinewebshop.net/96895673428.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 5296 bytes
SHA-256: 5f39c6123ba493449c763603c71b1ea1955c19fa866118e371dcf870e42655ce
font_01_sfnt_off0000f8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E2 11008 bytes
SHA-256: 8c3eefaa14af65192995de4d820c5774f402c4364544100cf7a83b784c6c37b0

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