Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efd1d1d80292e62…

MALICIOUS

PDF

80.5 KB Created: 2021-01-04 18:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a1b25cb0e07928d616cda43b920bae9d SHA-1: 790f5214df22495a76b1b30217726cccf5a36b8a SHA-256: 4efd1d1d80292e62c8c2f6896368a1e8777edf2f030e05ab14560ed80ba2edde
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirectors and link farms. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cctraff.ru/123?utm_term=lyme+disease+and+pregnancy+complications In PDF document text
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/961487.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/hiigejf/66764953277.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/dwidjjq/yellowstone_tv_show_cast_teeter.pdfIn PDF document text
    • https://cdn.sqhk.co/fakupavod/Djgviin/middle_finger_emoji_gone_ios_12.pdfIn PDF document text
    • https://cdn.sqhk.co/joxesinejag/LigEihz/32174047738.pdfIn PDF document text
    • https://mixasokuxorizu.weebly.com/uploads/1/3/4/7/134742222/cc3a3ae7.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxeneson/jbjiYjd/rail_rush_worlds_free_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zezoxomop/KhbjcOa/zejurivebebufasavopovo.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/lojigevaxive/lowes_coupons_2019_in_store.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/witezusalubosovapixuvere.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/bass_clarinet_jazz_solo_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/simplygo_mini_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/android_os_latest_version_for_pc.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_off0000fed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED9 5436 bytes
SHA-256: cee75a7ce12155baf222512fef36a33e6a782a7e38b85867845bf60fcbb6a401
font_01_sfnt_off0001114e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114E 10544 bytes
SHA-256: 7fb3620c5b65b2a2e0f1a3a7c3ca01cab8f16ca5638806ff76ae3efedb422161

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