Malicious PDF — malware analysis report

Static analysis result for SHA-256 17cf8a69399a49ea…

MALICIOUS

PDF

76.2 KB Created: 2021-02-16 04:12:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 46717d92bf819b377e84b2e2ec6573b0 SHA-1: 1d041eaa1e510b609a59a1f6abe4043469b81691 SHA-256: 17cf8a69399a49ea21ba758e66d42d38a8c69b897109ae5f3dcd03ea7c8ac6af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this phishing intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=professionalism+skills+for+workplace+success+pdf+free PDF link annotation
    • http://islta.fun/900746293516cwi2.pdfIn PDF document text
    • http://xonesasa.iblogger.org/the_lord_of_the_rings_movie_collection.pdfIn PDF document text
    • http://good-production9.site/guardian_drama_vostfrrlct8.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/UBhbPle/two_player_chess_app_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/huhelge/75299675224.pdfIn PDF document text
    • http://tevalevas.22web.org/88404599565.pdfIn PDF document text
    • https://cdn.sqhk.co/jikogifuxa/c2lLgdH/gilamorupiwokivow.pdfIn PDF document text
    • http://furogoverakafex.22web.org/jekapus.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/gifmK51/extinction_meaning_aba.pdfIn PDF document text
    • http://good-production9.site/distribution_agreement_template_australiazmnx0.pdfIn PDF document text
    • http://kekukuxowan.22web.org/madumukukubunuvak.pdfIn PDF document text
    • http://beremoter.online/article_crime_prevention_spm_2014_answer5drr5.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/simujix/laceration_zed_guide.pdfIn PDF document text
    • http://kazowaz.rf.gd/o_mio_babbino_caro_sheet_music_soprano.pdfIn PDF document text
    • http://tufobiwileke.rf.gd/gofetajanomirasuw.pdfIn PDF document text
    • http://kesajuwigiferu.epizy.com/65169212270.pdfIn PDF document text
    • http://jenuvuzawo.epizy.com/german_imperative_form_of_sehen.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/redafobupapigokesi.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/54204613228.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/92050302661.pdfIn PDF document text
    • http://xosareregaka.epizy.com/4545287798.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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5456 bytes
SHA-256: df99ac7f68a5587ea02b60d2392252d7eab7545e89d6f8af6806f59087a14136
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10508 bytes
SHA-256: ea36f8834cd1cdf02124d3749fe552c90fcfe6e49ccb40ff6f1a79bd507a836e

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