Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62f5eaaf294e98e…

MALICIOUS

PDF

84.7 KB Created: 2021-04-05 00:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 301435dce4da4287c2748004be78bdfe SHA-1: b6722374244517ff13ba4dd68a87fa1ab7eacc2e SHA-256: b62f5eaaf294e98e1d695d1ec67b6280cbe66293158e7e7a99cb0fe64c92688a
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm designed to redirect users to external websites, with one prominent URL identified as suspicious. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI point towards an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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=ruins+of+thundertree+battle+map
    • https://cdn-cms.f-static.net/uploads/4401691/normal_600a08f62857d.pdf
    • http://jiloxoxono.iblogger.org/padori.pdf
    • http://belugol.22web.org/lodaripida.pdf
    • https://static.s123-cdn-static.com/uploads/4383929/normal_6004ac83e4fae.pdf
    • http://zamowafa.mywebcommunity.org/candlestick_forex.pdf
    • https://cdn-cms.f-static.net/uploads/4468255/normal_6011653d9c66c.pdf
    • http://ruvinowuge.scienceontheweb.net/what_is_reiki_level_1_attunement.pdf
    • http://levelupguild.com/contractions_worksheets_for_esl_studentsigvtz.pdf
    • http://kizezum.22web.org/cg_police_si_syllabus_download.pdf
    • https://cdn-cms.f-static.net/uploads/4426832/normal_60183b637ba25.pdf
    • http://boost-store.net/dadodaxuxpm36p.pdf
    • http://senteber.site/cyborg_hollywood_movie_free2dbxy.pdf
    • http://lobabinuladeri.medianewsonline.com/mewesidupesodisewebo.pdf
    • https://cdn-cms.f-static.net/uploads/4381964/normal_6022395bce874.pdf
    • http://mopowataxix.medianewsonline.com/lokesizamefonen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/2182314b-287c-4609-8040-41021bf5cd17/fuvukuweporonaxifumipiwal.pdf
    • http://zajupulavofawi.myartsonline.com/albert_pike_arkansas_history.pdf
    • http://voxokemawabam.rf.gd/bible_lesson_for_married_couples.pdf
    • http://vorawaforase.epizy.com/datefubuwitoludute.pdf
    • http://mezubivedoxida.epizy.com/79262967261.pdf
    • http://gogositanisewu.rf.gd/digital_technology_platform.pdf
    • http://nomapalugaji.epizy.com/buzzer_round_questions_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/1e5ac9e5-cabf-4d19-83d0-af43c17dcabb/suunto_core_all_black_user_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001000e.bin
2a10f2b8565834ecdeda07d342f87fdb7c0d9b5ce1756cfe854923403f400697		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 5308 bytes
font_01_sfnt_off000111e0.bin
f8e2ec51194423696609ad9e339305cdb52f8d16bdd1ddfc66de8595250f4d99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E0 10908 bytes
font_02_sfnt_off00013743.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13743 4324 bytes

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