Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35f56cf94e3e2e4…

MALICIOUS

PDF

87.7 KB Created: 2021-04-14 12:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15a56e21b3cac6f22972fa31d78711c1 SHA-1: 24b07900ede499752792763c4a0c7fbaf8920ad2 SHA-256: f35f56cf94e3e2e4b104609ee99c00b2320f1418538f2b470ddf0a20fe997302
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=what+are+the+top+10+issues+in+america PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483338/normal_604374d1e2735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489409/normal_6052068c9b383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379498/normal_606695247c29d.pdfIn PDF document text
    • http://momarivido.mypressonline.com/23690126303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450639/normal_5fdfac5f60b17.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/6hdigjb/calligraphy_fonts_free_marathi.pdfIn PDF document text
    • http://pe50off.info/the_alienist_season_1_episode_2_plotymc4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460228/normal_605cf3868c92b.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/binedajiw.pdfIn PDF document text
    • https://cdn.sqhk.co/woxekivepi/WhfmERv/pexizotodagoxukupa.pdfIn PDF document text
    • http://moviesaddaa.online/bhojpuri_birha_geeta_tyagi801xk.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/actividades_de_angulos_complementarios_y_suplementarios.pdfIn PDF document text
    • http://floradoma.net/133227507412r687.pdfIn PDF document text
    • http://fewutame.getenjoyment.net/acls_new_guidelines.pdfIn PDF document text
    • http://makamar.xyz/radufupepijuxokilq2j4.pdfIn PDF document text
    • http://xorimomupajo.scienceontheweb.net/california_real_estate_agent_exam_preparation.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/eidhb04/63335693409.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_44fb8f92a5f943da94b1d8011901a308.pdf?index=trueIn PDF document text
    • http://fataragoreb.myartsonline.com/centrifugal_pump_parts_and_working.pdfIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_13daa9ab06eb4b6a9a73f0ca8bf7ea77.pdf?index=trueIn PDF document text
    • http://namakanexir.atwebpages.com/rijupakulikofopizujutoget.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_off00011944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11944 5348 bytes
SHA-256: fffaf2ff8a6d85c0e852cf078bab52576d0bfe49efd42fa81420584f3c23094f
font_01_sfnt_off00012b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B57 11100 bytes
SHA-256: 8a0cf5594903cdff245bbf82936e27ee97a6233024ffc7bbd999266160f43de5