Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33c828bbf7a44f7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-22 01:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4af8493f5de95aefdf8f04b25ebefec2 SHA-1: 225407fffe5e50ce8dfa82c763384cc3bf412f56 SHA-256: b33c828bbf7a44f7f1784bfc1f4106096186d8c8a3f061aa76571e2884cc3f41
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, which is likely used to host a malicious payload or redirect to a phishing site. The document body appears to be malformed or obfuscated, but the presence of external URIs and the high risk score indicate a phishing or malware distribution attempt.

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://maypoin.ru/wix?keyword=dover+elevator+buttons
    • https://cdn.sqhk.co/mazonixun/HEUigta/gufotawuriva.pdf
    • http://pupunorip.getenjoyment.net/apresentao_da_empresa.pdf
    • http://gejokakop.mygamesonline.org/astronomy_survey.pdf
    • https://cdn.sqhk.co/kadukugobug/erZjcKc/water_drops_live_wallpaper_app.pdf
    • http://bopolubolef.mywebcommunity.org/xezuresedinurusisen.pdf
    • http://lonotel.mygamesonline.org/celebrate_recovery_step_study.pdf
    • https://cdn.sqhk.co/nadoranur/OgiP8ii/masofavubavupetexotev.pdf
    • http://vofigasu.medianewsonline.com/al_quran_dengan_terjemahan.pdf
    • https://cdn.sqhk.co/dugelabomaw/aZtcjiR/46908528077.pdf
    • http://jabudapitu.scienceontheweb.net/castrol_lmx_grease.pdf
    • http://badoxik.scienceontheweb.net/17757764824.pdf
    • https://cdn.sqhk.co/daxozazon/gifYgHD/stickman_ninja_fighting_games.pdf
    • http://texoraw.sportsontheweb.net/69885329562.pdf
    • http://zapixexarepol.medianewsonline.com/rirafuwibegarotimuv.pdf
    • http://potawuzaj.medianewsonline.com/93161447247.pdf
    • http://segaruzobuguses.scienceontheweb.net/xomizuxonutopibikofuxu.pdf
    • http://widonatozeg.mypressonline.com/85187936222.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zeworibuzoza/adidas_nite_jogger_performance_review.pdf
    • https://s3.amazonaws.com/wuvepilamamuse/31787770916.pdf
    • http://zokaramizixa.atwebpages.com/jolusisitivudun.pdf
    • http://xukokumo.myartsonline.com/what_is_your_slant_meaning.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_off0000f9fa.bin
ed202f606c60b9f9d28e44559a7ae03e87120f4f5e827886bc8ad6ce4d5815cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 4880 bytes
font_01_sfnt_off00010aa6.bin
fd3ce926171cbfa4065ef5914780a0dfd20ba0207a2aa2225a095effcd278d36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 11692 bytes

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