Malicious PDF — malware analysis report

Static analysis result for SHA-256 474bbb2be0d9d73b…

MALICIOUS

PDF

64.0 KB Created: 2020-12-07 02:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a40b6664998de6be163af1ca0cb2a13a SHA-1: 18a92b500ba7a22b8b0498e10119bcdc68624370 SHA-256: 474bbb2be0d9d73b4409f2e8ac94471ebe1eea095cd086acba98f081a92bdcc2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong intent to redirect users to external, potentially malicious, sites. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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://cctraff.ru/123?utm_term=pierce+county+dog+pound In PDF document text
    • https://zisokilusativ.weebly.com/uploads/1/3/2/3/132303079/91bff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/peppermoths_weebly_answers_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/731f1396-89a7-4b06-88fa-a1e6feeee9fb/kids_n_us_daycare_richmond_va.pdfIn PDF document text
    • https://s3.amazonaws.com/tevigotu/medicare_part_a_application_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dc06578-50f7-49c4-a552-67b76e1cebaa/futurama_worlds_of_tomorrow_pizza_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed512e93-24ec-408e-9910-b16a31510e4f/hamilton_the_revolution_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08aed9de-a905-445d-870c-0e7359646067/67630981524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09607827-8bb6-49b3-a55e-8680f1c73b30/86842386378.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86301cc9-37e6-4fb9-8c51-690d23172f0d/nafekowa.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_off0000bd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD46 4924 bytes
SHA-256: 7cfad6bd0f1f7d9a774dad584f33066044a547a2fcfd62321b61bdcc8e4202d0
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 11024 bytes
SHA-256: 3ec7ce7e2707b73c1dc02fd31c8cd776c52a64113043ca4e5ebd22c3c7169337

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