Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae482810991ff4a…

MALICIOUS

PDF

88.6 KB Created: 2021-05-31 19:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 06337bc1038c11fe9f4cc394c5290cfb SHA-1: a419f950b875b74875187e6935c4075a20ad6453 SHA-256: 8ae482810991ff4ad6225661305250dcc2028a00a528e7fba65cf1e538a4a250
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to distribute malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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://crysiq.ru/pbw?utm_term=the+siren+kiera+cass+pdf+english PDF link annotation
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/ziwatizagew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_602da5eb19ee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5ff4c8fdd4d89.pdfIn PDF document text
    • https://jeregixir.weebly.com/uploads/1/3/1/3/131381720/sapafaz-kugopu-mopejovelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390680/normal_5ffa35536e3b2.pdfIn PDF document text
    • https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/1797235.pdfIn PDF document text
    • https://wowobomufib.weebly.com/uploads/1/3/0/8/130874304/jubagero_vamodizixozik_tigutu_lotagufunidix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475852/normal_6031548c70b41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369508/normal_5ff9f6fff3bb9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484609/normal_6008aa0e874f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465255/normal_600d6e79eb2e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446151/normal_5ff8476322d33.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4486374/normal_60aff43fb7101.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451760/normal_60029ed5db492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387577/normal_6051f9dc42ac4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_60215e4178ede.pdfIn PDF document text
    • https://dupuzebor.weebly.com/uploads/1/3/4/6/134639309/7193030.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477409/normal_5feb7afe857f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_600219b4f15de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388617/normal_603c5ec69050c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/35109226-1aa2-45f5-86a6-a00c722abcec/text_to_danny_boy_tune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2396c3bf-99de-4605-946d-ed8dddeb2a8f/tegodesitazogij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7872ab35-2835-4734-bc0c-4e15b2763a86/how_to_set_citizen_eco_drive_radio_controlled_world_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8115272e-2e36-448a-b0b3-8a02b23ecbac/zewosek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19143ba6-af25-4325-8b30-ee50f366423e/ridgid_air_compressor_parts_of45150a.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_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 5428 bytes
SHA-256: c0375a36549e5df3b04690b8f1ecbd50a12e8d1e174ac828979324d9bed40332
font_01_sfnt_off00012e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E2E 11356 bytes
SHA-256: ffbe7b89c3b4410c38d2d06ce83f4ea7b55fba1d25a717b1ea8388fb8d4974d4

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