Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d565c35d08bf16…

MALICIOUS

PDF

69.5 KB Created: 2020-11-25 20:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 328bfbeb4c95058279b92c10b371d8b8 SHA-1: 1fd61113b17a3c9da96fad71da8bd1407195ac50 SHA-256: 53d565c35d08bf1672b175a1d2edffb08da01142a80f48d42a272aa974fd318d
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded URLs suggest an attempt to lure users to external sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=biblia+latinoamericana+salmos+audio
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/2025729.pdf
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f8756c454f91.pdf
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5f9a373acbc80.pdf
    • https://cdn-cms.f-static.net/uploads/4369671/normal_5f8d18658848d.pdf
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5f9478288f7f5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/d4f621bd-acb1-44cd-ae14-c39a68244898/bavutuxer.pdf
    • https://uploads.strikinglycdn.com/files/5a94ef93-3fbb-4de9-925a-49329ea355e0/dowuvefowuwaxuwulez.pdf
    • https://uploads.strikinglycdn.com/files/ef61bed4-295c-4d45-9994-8f1fca4ef73e/betebirojazibibagujuxev.pdf
    • https://uploads.strikinglycdn.com/files/eb835cea-d8ab-49fb-aec5-0191f637d5fa/reproduccion_de_ninfas_en_cautiverio.pdf
    • https://uploads.strikinglycdn.com/files/2648c302-3f59-4512-8bf9-849797c3c72c/28236644690.pdf
    • https://uploads.strikinglycdn.com/files/6d448370-20a9-4420-a886-3aa215ed2bd4/transformers_the_ultimate_guide_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c302.bin
94af130ab23cac5070057e2f78142f93c49a858bfbddb4de8de2530c2e243fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC302 5156 bytes
font_01_sfnt_off0000d45a.bin
4a95c7db31b047c46294689396bd2fe2b8cbbbb3c64974579cddea948f1993d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD45A 11444 bytes
font_02_sfnt_off0000f999.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 4324 bytes

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