Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d90d0e1b1507a6…

MALICIOUS

PDF

74.0 KB Created: 2021-03-16 10:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 49d9330459816ddc588087c88ebac886 SHA-1: 9bd3b99f80937850d0563252b45411db1813d831 SHA-256: 64d90d0e1b1507a6b479bbb548504004d8b8e466d3393008d45d53b318541c69
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URLs and the document body suggest a phishing lure, attempting to trick users into downloading a PDF by posing as a search result for a specific book. The presence of external URIs and link farm characteristics further support this. The primary malicious URL identified is https://ponafet.ru/wix?keyword=envision+in+depth+4th+edition+pdf+download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ponafet.ru/wix?keyword=envision+in+depth+4th+edition+pdf+download PDF link annotation
    • http://rigojakivuvemi.iblogger.org/kutojoxutonugebaweledok.pdfIn PDF document text
    • https://cdn.sqhk.co/lomekojop/jmhaPuS/napexebolupezazufotimir.pdfIn PDF document text
    • https://cdn.sqhk.co/turaxulefa/gcQQhfB/moto_rush_gt_gameplay.pdfIn PDF document text
    • http://bezoxafeme.iblogger.org/synonyms_words.pdfIn PDF document text
    • http://lutikewoduwafev.iblogger.org/frasers_property_singapore_annual_report.pdfIn PDF document text
    • http://futuroke.iblogger.org/42505105233.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/gulapore/androidx_appbarlayout_xml.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b1520fa-0822-4dec-a114-76e61ebda5e1/does_punctuation_go_inside_inverted_commas.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/purpose_of_accession_number_in_bioinformatics.pdfIn PDF document text
    • http://jasixerebav.epizy.com/windows_10_64_bit_2018.pdfIn PDF document text
    • http://lanuseponozowut.rf.gd/ceremony_penguin_classics_deluxe_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c99b70fe-87c6-41a3-9361-e91742ee448d/best_day_trading_strategies_for_forex.pdfIn PDF document text
    • http://suziwifu.rf.gd/disaster_recovery_plan_template_for_healthcare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a078c3dd-f0fa-4f8c-9a05-ec5f2eaf80ef/how_do_you_reset_a_braun_thermoscan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a1c2389-5262-4460-ab5d-9e18f6b5545a/john_trimble_writing_with_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2bd421-699b-4919-aca5-2eff056f5bcf/28042080528.pdfIn PDF document text
    • http://vanomuwoz.epizy.com/teks_sholawat_burdah_lengkap.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_off0000df94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 5232 bytes
SHA-256: ca693d86b46ec1fd90ea05bf8a8ff1365ffd6b2a023b5fe16412486afd3c779f
font_01_sfnt_off0000f184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF184 11940 bytes
SHA-256: c8e3382a74e1cce1cb8b526d44af9396f358e7124c1ca215a43313fe07ffb286

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