Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1d30395b359fa7…

MALICIOUS

PDF

67.4 KB Created: 2020-11-16 15:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0f52ba149bb3c535efdbc7382c55233f SHA-1: 06b4e03623bb44c30d1db91cebe7c2f2ed28b92e SHA-256: 5c1d30395b359fa7e5da8b777af460b540e404cc87f5eaa21a833611674bfbef
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary heuristic identifying it as a link farm designed to redirect users to malicious infrastructure. The presence of a known malicious redirector URL further supports this. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded links suggest an attempt to leverage web-based redirection for malicious purposes, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=okemos+high+school+address In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366340/normal_5fa00a6a35c0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378641/normal_5f8a22815af0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369908/normal_5fa3af2fa3121.pdfIn PDF document text
    • https://tejovobomogopiz.weebly.com/uploads/1/3/4/6/134626725/guvegutum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f87660911cdc.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/10da9145-8bbd-4f4c-af4e-80550399f29d/chemical_formula_for_opal.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/sistemas_de_simulacion.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/jigsaw_guide_rail_bosch.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/dakajana.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/chupke_chupke_1975_movie_720p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3d186d-f12f-414c-a47a-65aa7cdb2dd8/players_club_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/funawirexu.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_off0000c907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC907 5444 bytes
SHA-256: f8d0da42e633375c57974cacc789e76c26e2f45a579411d9163535008f21996f
font_01_sfnt_off0000db62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 11188 bytes
SHA-256: 12082f446e453a1e55bc8698cf7fce7d209f6736aae9e7541b93492a4d908271

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