Malicious PDF — malware analysis report

Static analysis result for SHA-256 735e350eba4d2a5c…

MALICIOUS

PDF

165.6 KB Created: 2021-06-04 06:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51349b2d715528c61fe0e02fdb84b42d SHA-1: d5d82e505a395997da454b88fb01e7bf034c3c91 SHA-256: 735e350eba4d2a5c2b10fd39e9b6b3875bd2592ddf2ad52bc025952b2789507d
96 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests a lure related to educational materials.

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
  • 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://xajibur.ru/123?utm_term=cambridge+fce+teacher%2527+s+handbook+pdf
    • https://cdn-cms.f-static.net/uploads/4379500/normal_602b3e6f96ebb.pdf
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/6474948.pdf
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/1136890.pdf
    • https://fusikejasuk.weebly.com/uploads/1/3/0/8/130874124/5ef181a7dc9d.pdf
    • https://zozolesib.weebly.com/uploads/1/3/4/6/134631165/facac1bb6b58c7d.pdf
    • https://static.s123-cdn-static.com/uploads/4378151/normal_5ffab705c3d06.pdf
    • https://cdn-cms.f-static.net/uploads/4366344/normal_6023c791f1b02.pdf
    • https://cdn-cms.f-static.net/uploads/4448539/normal_6038d7d284389.pdf
    • https://dawanuma.weebly.com/uploads/1/3/4/3/134305997/ee07c3387947432.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/34160f5c-db5b-4597-aab6-738a587ce809/gurirabewaju.pdf
    • https://uploads.strikinglycdn.com/files/f5740d01-83d5-4b2d-a820-6155e3a11464/jasisugawufeb.pdf
    • https://uploads.strikinglycdn.com/files/07142754-0f5e-45d6-a74f-e8583530ee94/descargar_musica_de_julion_alvarez_afuera_esta_lloviendo.pdf
    • https://uploads.strikinglycdn.com/files/c2505c86-6f1d-470a-8b9b-3455cb6ae894/67403070737.pdf
    • http://kufavuva.pbworks.com/w/file/fetch/144576639/ritomeluwufulilojo.pdf
    • http://ruxafonan.pbworks.com/f/how_to_adjust_toro_600_sprinkler_heads.pdf
    • https://uploads.strikinglycdn.com/files/9c8500a0-ade1-48fb-a4f8-a0edfbd7891e/best_rated_infrared_heaters_consumer_reports.pdf
    • https://uploads.strikinglycdn.com/files/28ac9481-6b36-494c-acca-c4ba064f0fc6/59964358955.pdf
    • https://uploads.strikinglycdn.com/files/7bece6b9-a9da-442b-ac7e-7f58a847ef5a/kutufimebaxumuzuxejo.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_off00024ef2.bin
7effe40e54c4a7e01ccacb73675c1e5257e1003615935ff66aba69039c2e8020
pdf-font-stream PDF embedded font (sfnt) at offset 0x24EF2 5680 bytes
font_01_sfnt_off0002621c.bin
9c3d5b1f43426d0e3902b9e7a0c71e45a8f68e675ed5947b9472e16704391b8d
pdf-font-stream PDF embedded font (sfnt) at offset 0x2621C 11280 bytes