Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58d3644e1245235…

MALICIOUS

PDF

79.7 KB Created: 2021-03-14 14:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d7d03c19f263ca6f1e5f4b6262c770a9 SHA-1: b62a2a800937791a77f91b8c99c1c4295c5a0722 SHA-256: f58d3644e1245235b33c889ea430e62816d9ea213bce5526ed0b79736a70af62
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used to distribute further malicious content or redirect users to phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on potentially untrusted domains, suggesting a campaign to lure victims.

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 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://vilenefex.ru/strik?utm_term=araby+short+story+plot PDF link annotation
    • http://lollipopa.online/xunefudezuriganuvivedc8ej.pdfIn PDF document text
    • https://cdn.sqhk.co/runusamopit/hidjiji/downtown_song_mp4_tinyjuke.pdfIn PDF document text
    • http://fullcreditreport.info/aristotle_metaphysics_book_2_summary529a2.pdfIn PDF document text
    • http://chategratis.online/cisco_ccna_exam_topics6197p.pdfIn PDF document text
    • http://kapusta.pro/forrest_gump_feather_theme_piano_sheetodwhm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476152/normal_5ffc984b6e87b.pdfIn PDF document text
    • https://cdn.sqhk.co/vumusokutil/hLjfsgf/roman_numerals_1-_20_quiz.pdfIn PDF document text
    • http://astropsychology.site/36512261201zj916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_601334bd29941.pdfIn PDF document text
    • http://lusizekemuva.22web.org/can_you_flat_tow_a_durango.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381321/normal_6023c2c3667f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486033/normal_60046e11ec7b6.pdfIn PDF document text
    • http://zuwazari.22web.org/tv_guide_for_tonight_melbourne.pdfIn PDF document text
    • http://vuxokiwi.22web.org/what_is_the_meaning_of_the_word_etymology_as_it_is_used_in_this_audio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_60381a03d6a22.pdfIn PDF document text
    • https://cdn.sqhk.co/jawefujivi/Tx0jdhi/footrock_2_mod_apk_home.pdfIn PDF document text
    • https://cdn.sqhk.co/gasawivu/bjhnjj5/air_traffic_control_tower_minecraft.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://botasalipigu.epizy.com/nec_advanced_analytics_platform_solution_templates.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_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 5140 bytes
SHA-256: 20647a68a00a5a958f06afb481eebf7e1d2b4998ccea35fc33494c65c294967f
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 10704 bytes
SHA-256: c4fd6322429ffef5763241d4c60fa1af6cfbbf1bd338590655491c07655c370d

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