Malicious PDF — malware analysis report

Static analysis result for SHA-256 466c665fdb850fe9…

MALICIOUS

PDF

111.3 KB Created: 2021-03-24 02:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 83aa9f5b54782d65284be10a60bba4a1 SHA-1: 2e03e28ced4115dab7f9e5470b5f0c0bf48df005 SHA-256: 466c665fdb850fe900208196e6ceee46be5eb55f597f0314b34cffa5164cf55d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://ponafet.ru/123?utm_term=apoplexy+treatment+guidelines PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402246/normal_6015d2817121f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444377/normal_6027dc67284c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_60090badbcbd6.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/aging_as_a_social_process_canada_and_beyond.pdfIn PDF document text
    • http://tulavesew.getenjoyment.net/40015567226.pdfIn PDF document text
    • http://gaxakemokesibit.22web.org/auggie_me_three_wonder_stories.pdfIn PDF document text
    • http://sodabisunuk.22web.org/signs_and_symbols_nabokov_explained.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/pavujiniz/davozatipilozux.pdfIn PDF document text
    • http://dimugowu.rf.gd/sidama.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_f99480e1cda14c0c8745830999c45866.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/genijusemu/dexter_s_laboratory_episodes_guide.pdfIn PDF document text
    • http://beruleruz.rf.gd/lomisamamuze.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/best_army_games_for_android_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/79744784949.pdfIn PDF document text
    • http://kugofabafomozo.epizy.com/buffer_solution_journal.pdfIn PDF document text
    • https://28481333-1ef2-46fb-8ebf-d56c3f24acbc.filesusr.com/ugd/314c35_fcdf2513a27942c3ae8d2a3fc303f25d.pdf?index=trueIn PDF document text
    • http://rosukijabadizi.epizy.com/audio_visual_video_maker_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_off00017585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17585 5440 bytes
SHA-256: c839877ce9d2bba67dccf279fdd52284e75cf69fdd446a12710e18af30e23f02
font_01_sfnt_off000187f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187F8 12192 bytes
SHA-256: 291b5d8a121526d9fa2c3c84946f218233a57d3975920953c607146a0a828f40

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