Malicious PDF — malware analysis report

Static analysis result for SHA-256 08555f1969685f5f…

MALICIOUS

PDF

87.4 KB Created: 2021-04-03 04:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c8c8890e6f9450e4219a407c973d0d8b SHA-1: bd582723a440b94ac5ce6a6033ae8550fadd4806 SHA-256: 08555f1969685f5f578e5124f6a8da43e2b0e3a3ce6475fce45a186cc2e4e868
136 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a phishing lure, specifically using an SEO redirector for a 'free-download' scam. The embedded URL, https://golowaki.ru/wix?keyword=trinity+ring+definition, is the primary indicator of this malicious activity. While no scripts were explicitly extracted, the PDF structure and the nature of the URL suggest an attempt to redirect users to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/wix?keyword=trinity+ring+definition PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462379/normal_5fc7650a3afc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6018d03eebfc9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465012/normal_5fd67dfedf349.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370317/normal_604564a05f29e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fc9158610823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_60318fab6ad23.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465250/normal_5ffa3da3b61a1.pdfIn PDF document text
    • http://fefikaniki.22web.org/insert_calendar_in_excel_spreadsheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_602d84c24c111.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527164/normal_6028300d508b6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/9530771c-9db0-49e1-b1c9-566226e5ca2d/what_is_nature_of_organisational_behaviour.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a43021-ba40-4807-9867-bb1b952ec601/83319920179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef84f79-10aa-4e17-a760-66b504aca975/12336053066.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/zamumizufoxudupur.pdfIn PDF document text
    • http://pogelejulogowev.rf.gd/what_religion_studies_the_quran.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/unhide_worksheet_in_excel_with_password.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/kawudupudasumugomom.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/51365581581.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 4492 bytes
SHA-256: b2a31c14dded66f0ac339f507662ff2f3d097d987dd178fa3d37eec0bb00ef4e
font_01_sfnt_off00011b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0B 11508 bytes
SHA-256: 11420c2ae36bdc998a2a0db28bddfcb930427fd1ab21f350164a6c01f7b2af9c
font_02_sfnt_off00014230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14230 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361