Malicious PDF — malware analysis report

Static analysis result for SHA-256 481c82ea36d0326f…

MALICIOUS

PDF

65.9 KB Created: 2021-03-28 14:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 673e3359b6d2b04f9387d9c8f3acbae7 SHA-1: d33bf57372e085077b266f6a7d9571742d4d25d8 SHA-256: 481c82ea36d0326fe1acd23f263e068d1c72706d4d1051ae8528b1bea6a0db52
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document is classified as malicious, exhibiting characteristics of a phishing lure and a link farm. The document body, though heavily obfuscated, combined with heuristic firings like 'SE_REMOTE_SUPPORT_LURE', suggests an attempt to trick the user into downloading or interacting with remote support tools. The presence of numerous external links, including 'https://nipisod.ru/strik?utm_term=acids+and+bases+cloze+worksheet+answer+key', indicates a potential effort to direct users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://nipisod.ru/strik?utm_term=acids+and+bases+cloze+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/wodelaganav/javcihE/muvujegomi.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/KV1hgpS/13453579457.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/webupimivakozafigelivugow.pdfIn PDF document text
    • http://smallita.space/palutosuwonafe0jkf3.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/btigiag/download_logmein_hamachi_filehippo.pdfIn PDF document text
    • https://cdn.sqhk.co/pagupuxu/xjdHmh8/voturiwimapubesubikeke.pdfIn PDF document text
    • http://sifimomikev.sportsontheweb.net/redes_sociales_y_autoestima_en_adolescentes.pdfIn PDF document text
    • http://autoport76.online/datoniwufozewenwp4d.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/gFWjd2Q/remix_shoes_lexington_ky.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/ePRsiif/cube_escape_paradox_chapter_2_books.pdfIn PDF document text
    • https://cdn.sqhk.co/mojikeke/Xz56Voq/background_hd_wallpaper_for_photoshop.pdfIn PDF document text
    • https://cdn.sqhk.co/xewebevij/EJjaFlz/4702233949.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/jjif8BG/classic_prototype_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/iiZ9yRt/nilelaziretosoxutore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_c405aabbfff747db88c2b4f759609301.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e767d54-683a-4a0c-8088-d59aa79efe83/where_are_barcalounger_chairs_made.pdfIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_d5850d1a7bd34b21bf543fbd29dbbf30.pdf?index=trueIn PDF document text
    • http://kepofif.onlinewebshop.net/administration_of_criminal_justice_law_of_lagos_state_download.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_3382589b944b444a8c24dd5e668b3751.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/591ec72e-49c4-47a8-9c3d-c88a39f1dab5/temonimilix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b5e3dc-75c6-42bd-8f64-25d1ca451c32/79443105029.pdfIn PDF document text
    • http://jorasixu.myartsonline.com/international_accounting_standard_37.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_off0000c5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C2 5464 bytes
SHA-256: 113d1771fe88b6c4d5d3666aadbe451025d9b104ec28033f8a6707d49e0eae35
font_01_sfnt_off0000d86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86D 9840 bytes
SHA-256: 24b0b6ce70535cbbf10e9dcf06f54b69f67e47caaea32ea70482288ad7b0e5c0

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