Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaddf345984d523…

MALICIOUS

PDF

80.2 KB Created: 2021-02-16 00:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 02bdc94e0749f478a1f2562cc031a203 SHA-1: 87d1d2a3170c37ad7c34853aab91b02374728dfa SHA-256: aaaddf345984d523ee009dcd64ea6c130551993901e0defeaed66c87cbe624eb
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that is likely part of a phishing lure, aiming to trick users into clicking it. The document body, though heavily obfuscated, suggests a theme related to studying in the USA, which is a common pretext for phishing attacks.

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://baarspo.ru/strik?utm_term=can+i+study+in+usa+without+sat PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467936/normal_5fd10ee8dcae3.pdfIn PDF document text
    • https://cdn.sqhk.co/mukibusu/DLicDke/throne_bikes_oil_slick.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487419/normal_6000c74019e69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371543/normal_5fc8b85808d0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412575/normal_5fc7d65e22aeb.pdfIn PDF document text
    • http://xivatididoxu.22web.org/maplestory_reboot_link_skill_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/rojisixel/gj3uhgS/turbo_stars_hack_app.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/Bhcig9C/buxodovikofavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_600f00892e67a.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/heje9vC/judexujibi.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/fezenur/jononevoxobowarigujegab.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/manualidades_para_navidad_nios_2_aos.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/consumers_report_outage.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/76291877571.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/amd_a4-_6300_network_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/52160391062.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/game_my_talking_tom_mod_apk.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_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 4884 bytes
SHA-256: c709f15e37aca25308d470c868265809011a28d218bbc7e02d00b6779221c3a0
font_01_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 11112 bytes
SHA-256: bc53efcdd1f50ca50d5433f3f98fce6784b32df29021bcb068f02f1cfc2d7092

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