Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ae05a899528579…

MALICIOUS

PDF

73.1 KB Created: 2021-01-08 08:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1edcc32f74ba9f6deacc43f5a57069c4 SHA-1: 764186b748fc65a7b10e0a30f3a246cfe12c8ced SHA-256: a9ae05a8995285794b688d65da2519c73896d086e43b4e609af410439b53a368
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a suspicious URL. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious link indicates an attempt to redirect the user to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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/aws?utm_term=chris+tomlin+home+free In PDF document text
    • https://cdn-cms.f-static.net/uploads/4499021/normal_5fb43a696f84d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454544/normal_5fc61e438d770.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/Ggejegc/lipato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366978/normal_5f87397ee2197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527747/normal_5feb042fb3025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5fba01ffada9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5f9839e99592f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5fbe7e0274cfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425533/normal_5fa06c56b0bde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374376/normal_5faee46319bd6.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/jZgifRC/81049347338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5fee61bd4e9e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408851/normal_5fa6e267d0b8c.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/zunaporam/13759084561.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/sinonimo_de_conforme_em_espanhol.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/ashirvada_mantram.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_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 4700 bytes
SHA-256: 651f60a5f509dc908bf02d4b28bbef44eeda71eccb12279828c4a103464b4405
font_01_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 10840 bytes
SHA-256: 22d8508a4be4084aa8921c53da6ae8a3b13419abf6a6a28fa2cdd91b0c8c8b31

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