Malicious PDF — malware analysis report

Static analysis result for SHA-256 685fb24e6a4d20d1…

MALICIOUS

PDF

66.2 KB Created: 2020-12-18 01:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20901ef7e17c02a407008a167db58c12 SHA-1: c0ed78b4d81cddc5cee0927f6e7bc84989733477 SHA-256: 685fb24e6a4d20d199448f5a527f39cf3204e841dd9c2c3cba41e191cc1ec7f3
96 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded URL that mimics a search result, likely intended to trick the user into visiting a malicious site. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/strik?utm_term=italian+love+cake+mario+batali
    • https://cdn-cms.f-static.net/uploads/4408711/normal_5fd6657bdd76b.pdf
    • https://cdn-cms.f-static.net/uploads/4457573/normal_5fb5e9e179590.pdf
    • https://cdn-cms.f-static.net/uploads/4450635/normal_5fd8bd255ee45.pdf
    • https://cdn-cms.f-static.net/uploads/4498392/normal_5faf05def04b8.pdf
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fd734537dd32.pdf
    • https://static.s123-cdn-static.com/uploads/4487894/normal_5fc523808d327.pdf
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fc714a517154.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc5d15e2bbd740658283cb1/t/5fc8b2836031f4738625e71b/1606988430472/9th_class_math_solution_app_download.pdf
    • https://static1.squarespace.com/static/5fc002d40b6b03258f30bf3d/t/5fc0e3f3f3de5e49b5850315/1606476788771/ipod_shuffle_user_guide_1st_generation.pdf
    • https://static1.squarespace.com/static/5fc6f7a381da8a590dadce4a/t/5fca24ed196a600d3c3a01c5/1607083245805/satawiwoko.pdf
    • https://uploads.strikinglycdn.com/files/baab7660-d249-430a-80c9-9474f8738612/7690166845.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c662.bin
d2bf085f42980978f4a0df9326cf0457f35f6c6ada5814c41f814988f909d2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC662 4968 bytes
font_01_sfnt_off0000d73e.bin
9f6bab5159deba9cad8796483ae449e06b1032df758d3037ef796c8fa2d044c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD73E 10608 bytes

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