Malicious PDF — malware analysis report

Static analysis result for SHA-256 35568640be03cf14…

MALICIOUS

PDF

76.5 KB Created: 2021-04-03 21:14:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6ad9cb67b50ca9db26235641fee9779c SHA-1: 74dd810d379489ed9a830d932fead75f788988f0 SHA-256: 35568640be03cf14eeddebd4936ff17470ff94bd5b1c784430eb097e0c0ef239
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by 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 4

  • 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.
  • 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://resalured.ru/123?utm_term=list+of+all+english+nouns+pdf PDF link annotation
    • http://online-bestshop.xyz/lolulularagaruyyyzb.pdfIn PDF document text
    • http://allwoman.site/types_of_sentences_structure_worksheet26769.pdfIn PDF document text
    • https://zolegezuboz.weebly.com/uploads/1/3/4/4/134462972/1f7abae.pdfIn PDF document text
    • https://kenomuxi.weebly.com/uploads/1/3/4/0/134042647/mudipu.pdfIn PDF document text
    • http://obzorov.site/biogas_production_business_planbp9i6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c100dd9-082c-426e-afb6-499a1e51540b/super_smash_bros_ultimate_easy_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5599e472-7148-4a24-96aa-a173cac07640/44871418757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/891bc31d-8cb4-415f-a599-04bd746212ae/xabawove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ee4fe70-c9b0-4095-a79e-65c6ba424d44/reglas_de_acentuacin_en_espaol_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a47fd2-5977-45d4-a542-42d052d47e20/28885117629.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a6408f-41de-4d09-a55e-122af215116f/tirirujibunigajoworo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/645241d5-19e3-46c2-8ce2-ce3f564620e6/dejamuzitepuzemanopud.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/78816957435.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/509891cf-d64c-4e18-a784-834199301189/mufejafasenugujuwoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc636dff-745a-4ec3-9c36-275f5ed7bc3c/59142602632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779901cf-4274-447c-923b-1f743de89a18/kopuwetitusixavat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf6c60e-4168-4402-a8ec-75a44ef372d3/how_to_thank_someone_for_a_quick_response.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6caf2e81-eca8-4c1b-9f3a-8316569731ba/grade_or_standard_of_excellence_crossword_clue.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/52016463761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab7cb746-7449-4b86-94c4-95653184cb24/74684643560.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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 5148 bytes
SHA-256: a915b85519c0aa30b955bc7954f3c60b50bd3ba8282f79d54108699a0b07c57e
font_01_sfnt_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 10808 bytes
SHA-256: d96157fe28cb1d190c8bc7fbf15691cd04b9b76af8bc4b29f0668d7ee4d2cff6

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