Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c8c4de25a74109a…

MALICIOUS

PDF

81.8 KB Created: 2021-03-21 04:19:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: af77cef95937da18706d0c0b69e1639d SHA-1: 91bbc2b7e8d7d0850e304f871e73dab1e580edd9 SHA-256: 5c8c4de25a74109ac2558dd88b9a10e31f82772e14cd5ef1b46c2c90659524b2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to contain search terms related to educational materials, likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/123?utm_term=mcdougal+littell+geometry+answers+chapter+3 PDF link annotation
    • https://cdn.sqhk.co/joxusozomilo/cjaTih8/functional_analysis_textbook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_5feb94b63d9cb.pdfIn PDF document text
    • http://komozazene.getenjoyment.net/jipebupekonusop.pdfIn PDF document text
    • http://kovuguzi.22web.org/towezodo.pdfIn PDF document text
    • http://wijetaz.mypressonline.com/mowaxesejinuvolunabovewed.pdfIn PDF document text
    • https://cdn.sqhk.co/sazalevimit/iaieUgi/15132344418.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452588/normal_6053636f27b8b.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/nanukolipefelub.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/G14gihf/garry_s_mod_world_war_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389816/normal_601dd88d36684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_6031afa02197b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403128/normal_5fd68521a55b1.pdfIn PDF document text
    • http://werojati.getenjoyment.net/what_is_the_meaning_and_definition_of_personnel_management.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454049/normal_60530d962e726.pdfIn PDF document text
    • http://kebenoda.scienceontheweb.net/32540234289.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/a6nijjb/street_of_rage_2_japan_rom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_6015ec02589d1.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/Uhaiggf/26036333620.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vobozezojip.onlinewebshop.net/a_raisin_in_the_sun_test_questions.pdfIn PDF document text
    • http://fovawipemezipu.myartsonline.com/nowizojamaju.pdfIn PDF document text
    • http://pebomotixot.myartsonline.com/arbitrage_pricing_theory_ita.pdfIn PDF document text
    • http://kegigija.atwebpages.com/51852989781.pdfIn PDF document text
    • http://zudoxovup.rf.gd/the_asset_allocation_decision_chapter_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 5732 bytes
SHA-256: acba6a7ababc5d7fbc0329d0382186c84a469145492f274163f648341660866d
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 11140 bytes
SHA-256: d0874cea875a35b9207d4289888e9e80910812b3eec25caedc59383cce2a6b58
font_02_sfnt_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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