Malicious PDF — malware analysis report

Static analysis result for SHA-256 3584f8aaeac879b9…

MALICIOUS

PDF

79.1 KB Created: 2021-05-01 19:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 57543f537223072f1b6c25e51664575e SHA-1: 958c0ea7e3b1ba91f20c946e4712617354970892 SHA-256: 3584f8aaeac879b9b45b1b027fbf4680fd7967394c11e070edcc54c2d042a059
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. 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, appears to be a lure related to gaming hardware, suggesting a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=is+asus+tuf+good+for+gaming
    • https://static.s123-cdn-static.com/uploads/4367297/normal_5ff58b410ac53.pdf
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5ff48c0b86f3c.pdf
    • https://cdn-cms.f-static.net/uploads/4479906/normal_606b0b99c4147.pdf
    • https://static.s123-cdn-static.com/uploads/4417405/normal_5fc6055353765.pdf
    • https://static.s123-cdn-static.com/uploads/4385436/normal_5fe062a7d47be.pdf
    • https://cdn-cms.f-static.net/uploads/4465149/normal_606d9331a53ab.pdf
    • https://static.s123-cdn-static.com/uploads/4458389/normal_5fc9e5c2df5e0.pdf
    • https://cdn-cms.f-static.net/uploads/4371800/normal_6046385db715a.pdf
    • https://cdn-cms.f-static.net/uploads/4388162/normal_601b14ae8e857.pdf
    • https://cdn-cms.f-static.net/uploads/4413119/normal_6049d5c933b70.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a6132035-7465-4fe4-be4e-2faa96c22dab.filesusr.com/ugd/cf950b_509f3041227b4f12bf5f8d2a22b82cb3.pdf?index=true
    • https://s3.amazonaws.com/xufoxorog/99820266786.pdf
    • https://s3.amazonaws.com/perurulexi/14003543552.pdf
    • https://uploads.strikinglycdn.com/files/7bd9c67d-58a2-42db-a687-343902ce57f7/minecraft_combat_handbook_read_online_free.pdf
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_3bde36b0b1a4443b8382693f32b2eda4.pdf?index=true
    • https://s3.amazonaws.com/metubevozisul/dopixowamorumakuxepujoxo.pdf
    • https://s3.amazonaws.com/dalava/firepower_2140_configuration_guide.pdf
    • https://uploads.strikinglycdn.com/files/d4452801-5bb3-4b35-97b8-a5ed0537d452/21239094272.pdf
    • https://s3.amazonaws.com/wulotugadag/aps_graduation_schedule_2021.pdf
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_a9207db3a5544ffd990ec6c9f627d97b.pdf?index=true
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_529d6780e3cf44c596f721eef808de2c.pdf?index=true
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_4f8425a2cca54a5085b5df4f7f1fbcc9.pdf?index=true
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_d980365c791c4584ac52fd7d5cdc5a5e.pdf?index=true
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_b63212eefb844f888dda50d9984b42f7.pdf?index=true
    • 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_off0000f8c4.bin
48f33ef1ff4b461ebe1498001522fa945e2a781912fbd688ae5f5b0d1749f533		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C4 5132 bytes
font_01_sfnt_off00010a27.bin
aea37e44fa49d7fc46f9bccaf66f604915500ee62d49602ec3e7e882dac6df34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A27 10748 bytes

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