Malicious PDF — malware analysis report

Static analysis result for SHA-256 3902f4d4b8e72a56…

MALICIOUS

PDF

60.2 KB Created: 2020-12-19 12:34:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: dbfe551aa51347b8155298dfeca0aa60 SHA-1: 045c3df079623e300f5eeb21e8c1abe9e60e1f08 SHA-256: 3902f4d4b8e72a56b99e577e2592bc3fe174720e3f5b908cd8303e91d08f6cd8
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a large number of external links, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL points to a suspicious domain, likely part of the attack chain. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://trafficel.ru/123?utm_term=yuntab+q88h+tablet+manual PDF link annotation
    • https://zozilevijuni.weebly.com/uploads/1/3/1/3/131383476/xamebarumada_satono.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/985271.pdfIn PDF document text
    • https://mubopizolofovo.weebly.com/uploads/1/3/4/4/134442803/rudoji-jadudupezizoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/linifezomidir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0ea8e78-aab3-4110-802c-308cb9fb5974/vikoladilevomezifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f048225e-5d0b-43a7-94dc-a7ff79d94f19/nasatoranipasi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4285564-69c1-4fef-a378-96f3ac87f3f3/606_area_code_usa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f577f053-1922-4622-b505-884b37b18acb/23182321206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecb773ee-efa1-4f2b-9024-b74aa0cacc30/48047299836.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/fulubotabulonibelovow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf01f910-8f92-4537-9d88-7ae8e591b8fa/60961293246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d9087a-3d71-48e9-bde1-e083a4330f5d/72589469835.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/13651446903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb139c70-86e7-4e43-a86d-ad61fe262694/bukowito.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1967afe4-250c-4245-b3da-2b0d069159f9/the_real_barenziah_v2_daggerfall.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_off0000ad8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8F 5072 bytes
SHA-256: f85191334bb4fcc07d023b0025c2e2771ee998dcf0305266d56813eabedce64d
font_01_sfnt_off0000beb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB1 11132 bytes
SHA-256: 3c8b2483b4994b8c2ded2a06cc7f19f5709ada01470134b085d267e412e7b371

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