Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f5e2159c949658b…

MALICIOUS

PDF

85.5 KB Created: 2021-03-18 11:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2488724d55eeea93c5ca3df34b4e3189 SHA-1: 1a63e69e0e8739939e08349d94ac0a62ce5ba4d7 SHA-256: 4f5e2159c949658bd3f7a508321f126651c7306512143d0ff7eb5cbe53a07b4e
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though truncated, suggests a lure related to 'Minecraft for chromebook apk', likely to entice clicks on these malicious URLs. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=minecraft+for+chromebook+apk In PDF document text
    • http://tersq.space/fairbanks_morse_3hp_z_engine_partse5v3h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491153/normal_5ff30cdb8f7d8.pdfIn PDF document text
    • https://cdn.sqhk.co/zixapegof/fiihcsv/fly_away_sheet_music.pdfIn PDF document text
    • http://xafopawiki.medianewsonline.com/estudios_biblicos_para_la_vida.pdfIn PDF document text
    • https://cdn.sqhk.co/tisojubew/lRhg2ij/sesorobilegemi.pdfIn PDF document text
    • http://probmaka.tech/lenen_und_partner_episodenguide_staffel_7hwcn5.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/iisgjii/mudiwu.pdfIn PDF document text
    • http://womotov.22web.org/calf_raise_machine_form.pdfIn PDF document text
    • http://xibawolafubiz.getenjoyment.net/top_10_penny_stocks_to_watch_this_week.pdfIn PDF document text
    • http://vokotavawer.iblogger.org/xolegunirar.pdfIn PDF document text
    • http://power-guard.shop/2016_audi_a3_quattro_owners_manualyynxh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496014/normal_6049d39dedf58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469355/normal_5fcf021f24417.pdfIn PDF document text
    • http://rexuwoxaga.sportsontheweb.net/update_quicken_2015_auf_finanzmanager.pdfIn PDF document text
    • http://crubr.space/wixofopufovulamuwiwadevufg6vkt.pdfIn PDF document text
    • http://wepirafigezatid.22web.org/29173842815.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://jaxejibowanub.rf.gd/4._what_are_the_pros_and_cons_of_trait_theories_of_personality.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/geparagitiduzav.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/zilugatom.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/jebewasoxuf.pdfIn PDF document text
    • http://piwapikefiraxi.rf.gd/simple_english_learning_course.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_off0001042e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042E 5040 bytes
SHA-256: 7dce9d1e6006168527927c2bca192673fd755356c2891cd1404c452aa0842c10
font_01_sfnt_off00011518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11518 11000 bytes
SHA-256: 50714787753184cdc2251ac3ee2118b5d58290a0e4dbdd640658a59287b1bc99
font_02_sfnt_off00013a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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