Malicious PDF — malware analysis report

Static analysis result for SHA-256 73af02275864aec4…

MALICIOUS

PDF

82.8 KB Created: 2021-02-23 05:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2f398ce6e0808a74cf31b81c78ae5bea SHA-1: c899bd23091d9bbaa16fcaf62b4ba2493a253372 SHA-256: 73af02275864aec467e7b6c4a245dec27cdcc92f8ea1ea503af91da7adb98dd6
126 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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to domains associated with link farms and disposable hosting, suggesting an attempt to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=poisson%20distribution%20mle%20variance PDF link annotation
    • http://stickerrus.ru/rope_swing_fails_2018jdl21.pdfIn PDF document text
    • http://pixelbarista.com/12610247677wmgrb.pdfIn PDF document text
    • http://topstop.site/how_much_do_emergency_room_residents_makesint4.pdfIn PDF document text
    • http://sodaapp.club/993793683ievdn.pdfIn PDF document text
    • http://ukrinsure.com/playstation_gold_headset_pc_micalkke.pdfIn PDF document text
    • http://wavesubikuviv.iblogger.org/pelelulaperopopezugoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_60050463101b0.pdfIn PDF document text
    • http://fapseo.ru/1756-en2tr_manual_espaolfjlp6.pdfIn PDF document text
    • http://kuxogajow.iblogger.org/40819317437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fcbbe7c66655.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litipodetipuwi.epizy.com/qasidah_burdah_melayu.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/tapilegotav.pdfIn PDF document text
    • http://wunilos.epizy.com/bahubali_2_hd_video_songs_pagalworld.pdfIn PDF document text
    • http://xuzifagavezi.epizy.com/paragraph_a_school_magazine.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_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 5284 bytes
SHA-256: f86295d93009b82a7ae004717f88794fe5b9a3ee4d79f88f48de745604204fe3
font_01_sfnt_off00011106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11106 13320 bytes
SHA-256: fd68518e7756a3815e7c2ff33f75e509349cecd41ea1347d941ea017120f55b1

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