Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a01ed5999ed26a…

MALICIOUS

PDF

82.9 KB Created: 2021-04-20 22:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 34ce7c17781ae1ac39a2f59f33629e63 SHA-1: ecf9fda5bee768d98cdbe2851834d4595d440b52 SHA-256: 84a01ed5999ed26a0b54fcc3f6257c6a758503f24a967cbabb2838ce9586b5c2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms used in phishing campaigns or to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL and the heuristic firings suggest the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=how+to+write+a+letter+requesting+a+month+to+month+lease PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485705/normal_60552da0c7989.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469370/normal_60268a74d735d.pdfIn PDF document text
    • https://todumubisopid.weebly.com/uploads/1/3/5/3/135312552/favegen_zabik.pdfIn PDF document text
    • https://zezebeburopixem.weebly.com/uploads/1/3/5/3/135326834/rabamafupisi-fopeku-towifid-nazerisitudoteg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465938/normal_5fcce9663020f.pdfIn PDF document text
    • https://majivuwuwu.weebly.com/uploads/1/3/2/6/132683475/3910595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368246/normal_6055f694cd423.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/db2d468c-a3f2-4219-8e16-732fa3bce14a/ejercicios_verbos_irregulares_ingles_1_eso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9a1e4c-00dc-490c-8753-65cbc70bf4a8/self_introduction_for_interview_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab72e68-f408-431c-aa7c-570a189c8c86/vimegubafozuladelut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40458094-2df2-4499-a885-294702ffb787/7135166588.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_0a7451e796c34831ab1f977d42f2b62f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf5c2b2-e5db-4f57-8000-ef1fccd5a5c0/soxagepurekotiremomonaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/469c00e5-0ce2-48dd-9372-8f7e46a6d994/carry_on_luggage_with_usb_charger.pdfIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_247ab273690046b1a6cafb5e3ae59d31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/brave_frontier_reddit_beginner_guide.pdfIn PDF document text
    • https://154530d8-637b-49d0-b90a-43bf07a176fb.filesusr.com/ugd/59359a_5f470c9d32c84be584d40fc3e084db11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e650180-5b46-4554-b45f-d459174a1bd6/49997954653.pdfIn PDF document text
    • https://s3.amazonaws.com/xulepiwa/windows_7_vpn_setup_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e809fbde-a373-44de-b248-62e8c03f2bea/how_to_inspect_your_new_home.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_off0000f93c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93C 5160 bytes
SHA-256: 4ef82cdd72a985d4af1ffd70e88cb0fc4ccdb62ad0cf60d3367b8c1712a4631f
font_01_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 10752 bytes
SHA-256: 2a42f125d57f16529d20b9a082157ac4392d30e3b8a699c79d94b27b45baa573
font_02_sfnt_off00012f68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F68 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230