Malicious PDF — malware analysis report

Static analysis result for SHA-256 4020ec15eb17269a…

MALICIOUS

PDF

71.6 KB Created: 2021-04-19 15:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 3a7979b7155634e41c2ebcd3812a3e9f SHA-1: 52e0323cad2c655519c412b1e9d2dd4285fe508e SHA-256: 4020ec15eb17269a2cc5e7a0c770d7e86563cbdaec9c11eaa9cf621e844c47d6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=hundreds+chart+mystery+picture+%252335 PDF link annotation
    • https://cdn.sqhk.co/lasijutag/khamhad/84769189735.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/Bdjdhbr/fadirodizumabavowesozosam.pdfIn PDF document text
    • https://cdn.sqhk.co/jenetuwuda/igdhihd/17888666113.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/KihgckG/xavekaxi.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvaratuji/H9giXKx/does_coffee_increase_heart_rate.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/history_of_autoimmunity.pdfIn PDF document text
    • http://wugupomovupa.sportsontheweb.net/jepufodukivelalorur.pdfIn PDF document text
    • https://cdn.sqhk.co/raxoxawupej/jihifgc/54880586476.pdfIn PDF document text
    • https://cdn.sqhk.co/mapetidul/tghTnjD/classic_combat_minecraft_mod.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/how_to_analyse_stocks.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/musoxifuvitalo/gilinuderupizoguziwofen.pdfIn PDF document text
    • https://s3.amazonaws.com/remuv/kuveri.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/apple_book_appointment_penrith.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/braco_cable_gland_selection_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9ba8704-6393-48fb-b262-f3683f622ca6/bissell_pet_hair_eraser_vacuum_troubleshooting.pdfIn PDF document text
    • http://vuzuwukef.atwebpages.com/inventions_of_the_industrial_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33a8978-cc8b-48a4-bb8b-e52d17ea86e1/weber_spirit_ii_grill_2_burner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3664af2a-7168-4762-957f-efd675ba05c4/the_scarlet_ibis_study_guide.pdfIn PDF document text
    • http://xekazaz.myartsonline.com/51192354455.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d85ea305-2dac-477d-b07d-c554a59efcab/how_to_answer_a_what_inspires_you_question.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b395e7e2-6c05-4258-a595-5784e2dd4638/att_velocity_prepaid_mobile_hotspot.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_off0000d78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78A 5344 bytes
SHA-256: 7d3309a139adf30ddc7c369f944ed7aa131ce90a307cef0dc1b68958eae3a987
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 11532 bytes
SHA-256: fd821a28b6c7ff737cd9ea11989bd98d71dfe24e9928a9dca8a5f752669910b7

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