Malicious PDF — malware analysis report

Static analysis result for SHA-256 6782351c810c298e…

MALICIOUS

PDF

76.4 KB Created: 2021-03-31 23:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a10a2b4b528731939fa738e3570eaf1b SHA-1: 567ca29fe0708576f5217d20d35c32abf7ee80b1 SHA-256: 6782351c810c298e29e76fb1a99a944b6aac26ffba7cfb4fc4f59b95d142782f
186 Risk Score

Malware Insights

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

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 0.9992

Heuristics 6

  • 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.
  • 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://midufefew.ru/123?utm_term=opera+browser+windows+vista PDF link annotation
    • https://xudarusutovupaf.weebly.com/uploads/1/3/0/8/130814591/122454.pdfIn PDF document text
    • https://manesufepal.weebly.com/uploads/1/3/1/3/131381078/noderifosoxe_purisaxexavigab.pdfIn PDF document text
    • http://difanitukovu.mywebcommunity.org/beautiful_in_white_sheet_music_free.pdfIn PDF document text
    • https://jesepivop.weebly.com/uploads/1/3/1/4/131483445/nojoxa-gavubimoxu-vikolitirig.pdfIn PDF document text
    • https://nivumumati.weebly.com/uploads/1/3/4/7/134703955/454501e8134eb1.pdfIn PDF document text
    • http://kuliwegi.sportsontheweb.net/anti_education_nietzsche.pdfIn PDF document text
    • https://subozabi.weebly.com/uploads/1/3/2/7/132710736/170944.pdfIn PDF document text
    • https://xaredeni.weebly.com/uploads/1/3/1/8/131871979/muvizagoxujozigex.pdfIn PDF document text
    • http://nebemor.mywebcommunity.org/57218542132.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/hr_balanced_scorecard.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/nopisaxagobejan.pdfIn PDF document text
    • https://zowotojezef.weebly.com/uploads/1/3/4/3/134330732/vibiwe-pepof-sazefodezegam.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/muxepikije_vekubamibavuwi_tamix_bopezisup.pdfIn PDF document text
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/5654646.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_d84b175bd9504ac3adfcc8ad36cb8d51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8f4069-4704-44aa-b139-da16f075e4f9/72082682673.pdfIn PDF document text
    • https://3c2b787d-8465-4662-bdcc-bf736d584291.filesusr.com/ugd/8760e7_6917d2ee16ea4a1fb3f1199c7142bf31.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f16d9810-6ee6-4c62-9c10-716827604475/37591055133.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_32146190f6da4c1daf3e25f31c93bcf5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7765774-44d0-405c-9237-b0b85bb98530/17534051605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed0f6115-09e6-4184-bc30-ad0769a01d1f/what_is_a_testatrix_legal_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e24836-1988-407d-9a63-0c483ccf8bfe/watch_big_little_lies_season_2_free_uk.pdfIn PDF document text
    • http://jugugesazo.myartsonline.com/amir_khusro_poetry_in_urdu.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_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 5240 bytes
SHA-256: feba6a65e7457ef1bd381da551b46bfb7c3d364132b8278cf4c33c9f1e21bfc3
font_01_sfnt_off0000ff7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 10748 bytes
SHA-256: ffef1b835f66e17af7413fa803175d0f033beb55104d1e8b8eff50cd14c8dc1b