Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffcf3f1a1cc8042…

MALICIOUS

PDF

65.6 KB Created: 2020-11-13 07:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: aced57855c7483e4cff48476691100cd SHA-1: 1e9889e060ee52c6f7650ebd46f8b2e0b774af79 SHA-256: 1ffcf3f1a1cc8042aa770bd85154ef2f0301c4b389d45f3dafce888161f5b0fd
214 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, indicating it's likely a phishing or redirector attempt. The file contains a large number of embedded URLs, many pointing to external PDF documents, suggesting it functions as a link farm. One critical heuristic identified a link to known malicious redirector infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=lightning+bolt+cartoon+pictures In PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/3032384.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/d45a5a10c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f88d3770833c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5f9bbf7b1c6e5.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/nuposus_dexonibawat_xulujuzajiraz.pdfIn PDF document text
    • https://xigunokitipir.weebly.com/uploads/1/3/4/6/134615451/tojojew.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/4adfc01d-0440-4aa2-949d-129692b91c57/cambridge_igcse_economics_textbook_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0645228a-135e-469c-89c9-547ead3c4502/shaolin_workout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b88e6e0f-336c-42fc-861b-7fdbbf813d8d/westcoast_choppers_bicycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2aa1ae-b42b-4a74-bd0e-f9f97cace58f/domino_s_pizza_phone_number_lookup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a098f054-f959-46f6-b6ae-2a865aa64812/temokarasejefesoxunu.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_off0000ba71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA71 5276 bytes
SHA-256: f8ce6db187ddd7769e7b3ef106476f195130a7380a00379ecaa449f6dccb299d
font_01_sfnt_off0000cc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5F 14448 bytes
SHA-256: c6066950fbeae19e02b49d741cb39640f1557555d093c086b724e1774dbae9e3

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