Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece6b55c6ae33266…

MALICIOUS

PDF

68.2 KB Created: 2021-03-18 06:17:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a4022ccea0833bd2c84df06b82c304eb SHA-1: 22d8e1f5e3c648c3c34dbdd2925ddeb22dc569f7 SHA-256: ece6b55c6ae33266e921c90f79e8403739928aa90632986af41f333dc1a89145
126 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links disguised as a catalogue. The primary URL, https://jottigo.ru/123?utm_term=mitutoyo+vernier+caliper+catalogue+pdf, suggests a potential SEO manipulation or phishing attempt. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jottigo.ru/123?utm_term=mitutoyo+vernier+caliper+catalogue+pdf PDF link annotation
    • https://cdn.sqhk.co/wolitobutak/i6gctVb/monkey_ball_adventure_ps2.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/UijwDgi/5236091707.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/gckigGa/rider_university_tuition_room_and_board.pdfIn PDF document text
    • http://mon-fortuneo.best/elements_compounds_and_mixtures_poem_worksheet_answerst9z7s.pdfIn PDF document text
    • https://cdn.sqhk.co/wajerewuwer/LgjihwD/26325911086.pdfIn PDF document text
    • http://ndfnasg.xyz/android_install_platform_tools_command_line44kzc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_16fa4c05ab764912a069023ec0b3ec95.pdf?index=trueIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_a7cba5464225458ca8e2f8e371f857ea.pdf?index=trueIn PDF document text
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_71a6d0be8110453e8e99d06b3a0340a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6d15caa-2bea-4aaf-8dcf-1ff8ee5cf8d9/bank_5_saturday_hours.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/binary_numbers_calculations.pdfIn PDF document text
    • http://vovojoj.atwebpages.com/turning_profit_into_cash.pdfIn PDF document text
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_c27d408ef6864157bb780151dcbb0b1a.pdf?index=trueIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_3fc22903637c4e9f96d0432c483f0d65.pdf?index=trueIn PDF document text
    • https://8f20b4bd-83f7-4a55-8c6f-e9501e2e061c.filesusr.com/ugd/c1c462_f5090c35335542398423773471e54ecc.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_0066ce33b009407b996c8936b0995621.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17bf7fe5-442f-4b79-9310-e3ff0b6a023f/dell_latitude_d820_drivers_download.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_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 5312 bytes
SHA-256: 30513c0c70e8f60603f5d7008f94cedd5c5ac7ed3e5761b79d46892045bf29df
font_01_sfnt_off0000e0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A8 10316 bytes
SHA-256: 3215202dd89070b65e900db72105a9186251a15e082bb831bb0a7d9617f21f52

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