Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ef6ebf3ae4f5f0…

MALICIOUS

PDF

76.3 KB Created: 2021-06-04 00:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3de3f756b5602f1df68191fb8290114c SHA-1: 20545e6d7235b392b9d51e12fe0a9eab2e003fa5 SHA-256: 06ef6ebf3ae4f5f09bccdb5042cb1896549da004569329a4facb81f678117fe1
186 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO abuse. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document's primary function is to redirect users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://krisoc.ru/pbw?utm_term=turkey+meatballs+giada PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475728/normal_602705d629a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368762/normal_605210ab76e88.pdfIn PDF document text
    • https://wevepoguf.weebly.com/uploads/1/3/4/7/134717949/1098c1.pdfIn PDF document text
    • https://mudujisobugabe.weebly.com/uploads/1/3/4/5/134511382/rexuxopadetopoxegiz.pdfIn PDF document text
    • https://zinubokutedoses.weebly.com/uploads/1/3/5/9/135956806/bdcc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446492/normal_6033088dd67a9.pdfIn PDF document text
    • https://gavivexov.weebly.com/uploads/1/3/4/6/134667590/5503844.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/b2438278-25cb-4442-9c39-38256c0f217e/beretta_owners_group.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff7d95bb-12e6-41f4-8491-fec8c7092cc5/what_happened_to_weste_erickson_from_these_woods_are_haunted.pdfIn PDF document text
    • http://malamojozag.pbworks.com/w/file/fetch/144578433/gadavozoxemogemajorefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b41db8e2-1f7e-4e0b-a817-6bcfa0f22c0f/how_do_i_change_the_sensitivity_on_my_night_owl_camera.pdfIn PDF document text
    • http://xovakovawup.pbworks.com/w/file/fetch/144522981/19933515089.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecc98bb-d837-46e9-9f3e-e14060adff75/dajezawonotikexoxidebadel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f617d0-ee11-455f-bfe8-2e6697ea8bc0/walmart_snow_tires_215_55r17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573c6876-2037-4d03-bbed-afb01fefe3bf/fedaborojupumamowap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485117cc-ae2b-4987-b95f-39253234f03c/wunazowonijowufenemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/551ace45-785f-4d6c-83fa-174f84786cc6/nawazizare.pdfIn PDF document text
    • http://disisopaz.pbworks.com/f/c.v_format_download_in_pakistan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abea744f-3371-45c2-b7f5-560f920a8c19/idioms_worksheets_second_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb65297d-841d-48bf-be1c-1203779ff306/98280674115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9308012-0f6a-4f5e-8a24-b8552b104978/sisisidopebemajubexeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0c701f-5339-4a5b-9c93-35c8b048c8a0/87746807149.pdfIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144578460/75564162183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f4e9f74-1bf5-4ed5-8383-031d2e321d71/how_to_fix_keurig_not_brewing_full_cup.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144475482/bunamutamosewatisimorute.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_off0000eacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACB 5400 bytes
SHA-256: 9adc0504334005de1f0ce6f8c80e0411ee7e7c1780a00e2c70c568e0a0be7b74
font_01_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 11460 bytes
SHA-256: 0c88f2730b43a12d3b48d53891abc16f765870866fa7d69a746080993136ce8c