Malicious PDF — malware analysis report

Static analysis result for SHA-256 a153f0abbaa73e19…

MALICIOUS

PDF

79.2 KB Created: 2021-05-23 06:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2e37fdc8a8a2bddd52229ea533aca104 SHA-1: 226feb49f40784a111f256e167ae7bb4afc93308 SHA-256: a153f0abbaa73e1969930b72c73693e15bcce5fd36c0a080c18813088d68feda
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many of which point to potentially malicious domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dugedepap.ru/strik?utm_term=what+does+nothing+but+the+best+mean PDF link annotation
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/mapur-rafakewon-jiwizifegumagod-pitarexuk.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/puwizazezeru.pdfIn PDF document text
    • https://kisoxorojapaga.weebly.com/uploads/1/3/7/5/137512046/0642b238e0e8ff.pdfIn PDF document text
    • https://nodararikerat.weebly.com/uploads/1/3/4/8/134885074/8fa489.pdfIn PDF document text
    • https://radinake.weebly.com/uploads/1/3/1/8/131856095/vobuxetidevutu.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/076d0dc7-c950-45f7-a9df-ac44e52d9097/makoxopawib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fd9a270-7cb9-464c-be45-dc8d28954dd8/62523693155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0fb2b92-2f56-447c-82c9-29d739df59d4/corporate_social_responsibility_definition_world_business_council_on_sustainable_development.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d909ecd9-60a0-427b-b7a2-c6b0942fab1e/sap_user_id_first_name_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ca1a17a-0eef-47c3-a7cf-9b4872e3d8ba/finite_element_method_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66998552-6c1b-4239-b6c8-e08087bd3eae/nezepimituxaxoduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e373035-858a-47bb-810e-b2dd2f19dd8b/what_does_trans_mean_as_a_prefix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b9375c-1779-4179-a6da-6df57adcfd73/36833536282.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a762f61a-b944-4468-aa0e-065d83fd8fa4/6811493752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d8b61e-dd34-46e3-962e-4f4ea9f4ca61/netgear_wndr3700_als_repeater_einrichten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e471417b-23a9-4ece-9e66-e4f464ca94cc/87284755163.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7118932-d8ba-452d-a446-2cf1bd1a9257/15110093025.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f097b0a-8849-4147-943b-016a925afb3c/sexual_reproduction_in_flowering_plants_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e05fe6-0a4e-49cb-91fc-f3b715093aab/gafemibekemogukijaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febe16f2-e513-4421-a41d-0d7389728590/nivivodulu.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_off0000f6b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B8 5264 bytes
SHA-256: d1c5f69ea44011d2f933f1f2dfd03f9fb0ebf5748fb0ee3d67f96177d0bf9b60
font_01_sfnt_off00010883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10883 10984 bytes
SHA-256: 2c9ca056a2de63d0a63158689a0a7cfc29cbd2e9c923520dfaf76f3412dde2b5