Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b09ccf65c6a8ff…

MALICIOUS

PDF

83.8 KB Created: 2021-03-02 00:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2b3161b22d8a3aed9a4caf65e6dba4b2 SHA-1: 5332905c5406da972b92d30e89cd7e50f103f7ce SHA-256: 80b09ccf65c6a8ffd2e2abc4a63418a73bea9fe096c9b281bd1dd6ab9c3c9bf6
186 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://resalured.ru/wix?keyword=ryan+leaf+draft+grade PDF link annotation
    • http://jasazotinalol.mygamesonline.org/lebuzexememov.pdfIn PDF document text
    • https://cdn.sqhk.co/xumefugafa/Giatr0p/will_it_crush_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/htOPCKT/78193577371.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/hQjdVgm/73125099595.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459328/normal_5fd91e4420065.pdfIn PDF document text
    • http://miribut.mywebcommunity.org/sole_f80_weight_capacity.pdfIn PDF document text
    • https://gokebapin.weebly.com/uploads/1/3/5/3/135320588/d43b9ba54.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/define_flowchart_proof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412900/normal_6001812b697e4.pdfIn PDF document text
    • https://cdn.sqhk.co/befozaxulot/ahIhaty/alpaca_world_hd_redeem_codes_2019.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/tascam_recorder_review.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/what_is_the_point_of_the_stranger.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/how_many_marlin_336_were_made.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/80604457838.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461780/normal_5fe1d199bc068.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470683/normal_60201b33ca824.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zevesijuduma.atwebpages.com/health_and_safety_officer_salary_ontario.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/cost_accounting_a_managerial_emphasis_chapter_4_solutions.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_off00010c38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C38 5004 bytes
SHA-256: 8fc38cbb1a2df362d27f2a9a1dfafbda6e5322da0d776654da09b990f9881c7e
font_01_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 10748 bytes
SHA-256: 1844266bfc02229e8bc2a296984319b60401d52a6f73c5455755864a0017c8a4

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