Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb79dde940d1bfab…

MALICIOUS

PDF

69.1 KB Created: 2021-03-05 08:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3956d56b40dadc333b065b55d0e215da SHA-1: 76f5c46370dd60007cb25a79032fd96505cada2b SHA-256: cb79dde940d1bfab38e24b6b2352fa4cba7d4974699b2e0e33444a763a122b45
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links within a large number of redirects. The document body, though heavily obfuscated, appears to be a lure related to a sewing machine manual, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=kenmore+sewing+machine+158.480+manual PDF link annotation
    • https://nesipemuwazona.weebly.com/uploads/1/3/4/8/134881126/jozebo.pdfIn PDF document text
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/a91fbac0208e.pdfIn PDF document text
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/1659137.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/haZiiNh/vawufidubisekupa.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/polaris_360_pool_cleaner_manual.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/derechos_humanos_consagrados_en_la_constitucion_de_la_republica_bolivariana_de_venezuela.pdfIn PDF document text
    • https://wajupinafuju.weebly.com/uploads/1/3/4/7/134752356/1763901.pdfIn PDF document text
    • http://votixibutiro.medianewsonline.com/quotes_about_love_in_the_book_their_eyes_were_watching_god.pdfIn PDF document text
    • https://cdn.sqhk.co/jilowepe/iZmIi9B/free_online_scientific_calculator_with_fractions_and_exponents.pdfIn PDF document text
    • https://poxosuliw.weebly.com/uploads/1/3/1/3/131383655/73a64be.pdfIn PDF document text
    • http://lakujalinifibo.mypressonline.com/vista_128_master_code.pdfIn PDF document text
    • http://paxosij.mygamesonline.org/sivoxivobaganit.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/colonial_comparison_chart.pdfIn PDF document text
    • https://cdn.sqhk.co/sojetaji/haH6EG6/amazon_fire_tablet_app_store_network_unreachable.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/jhs4jgy/jaridedeme.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/werowibovezoje/kopaleludewaze.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/aha_guidelines_stroke_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb00a64d-1794-4cd8-8a57-02fe96c5eff3/53379023225.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/19796834291.pdfIn PDF document text
    • http://zevusup.atwebpages.com/the_other_side_of_the_door_full_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b4e7698-6e0b-41b5-a48f-01cfffb921b0/gakibarig.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_off0000d0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DF 5904 bytes
SHA-256: a50977ad2636206e74ca5d12266163f7b70f3351b007aa498122bf56a49796f6
font_01_sfnt_off0000e4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FA 10052 bytes
SHA-256: 97cd13cb7fee03d52b48a99a2b3d3d3d123d18b47a2a61b0dca24b3e18d80d0c

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