Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd42516823d9028…

MALICIOUS

PDF

68.4 KB Created: 2020-12-17 01:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7f67eddc16086364731a25c575b88500 SHA-1: 905ffcda54604cc1a18831516e696666dc606347 SHA-256: 3dd42516823d9028afce6cf5348bd8e30c1260a76e3fab45e9b22208c6f65991
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated, but the presence of links and the heuristic firings point to an attack pattern involving redirection to external malicious infrastructure.

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
  • 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://ggtraff.ru/123?utm_term=group+theory+pdf+nptel In PDF document text
    • https://temizitukopisir.weebly.com/uploads/1/3/4/8/134898891/tepijepebijefiv-lekiro-joguvefujiduwop-xavomebop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479235/normal_5fce0748e1575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402246/normal_5faad0e5efb03.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/wazorixekunafob/79397011063.pdfIn PDF document text
    • https://s3.amazonaws.com/minegikukovel/antonyms_worksheet_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24c32a14-c92d-40b5-bb36-a74c9016a248/frozen_2_full_movie_watch_online_youtube.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/anacharis_scoria_rules.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/metro_crossword_answers_uk_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/705cbaf8-975f-4c97-a921-518f9bde5898/83246345698.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/18634780127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf76421d-be5f-4dda-b8da-c17d7d1b3514/nicholas_i_of_russia_siblings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e69f553-2d92-4ae5-8ffb-ebc3348ac079/double_cut_saw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9aaf9d-1f71-46a8-ba69-8a7fc75a1a5e/sivobizopopefik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11ec3b7-28c0-4784-bed5-b281759d7b3f/juzimofabepukufexotejir.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_off0000cf77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF77 4872 bytes
SHA-256: a956523d271148180c51d1a070fe5a48e2855bdb61a2820ce148f22585227470
font_01_sfnt_off0000e013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE013 11372 bytes
SHA-256: 34011bda806b4fe418858594c132b54fc7456999e6752741312e46f6b825fb92

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