Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a620e5ecc73e862…

MALICIOUS

PDF

79.7 KB Created: 2021-03-29 20:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1f69799f2c854e6fb2e0381148db4cfc SHA-1: 51c1c15b67d8cbed9f65ce9e28e54f96f265b6ce SHA-256: 2a620e5ecc73e862ff9582875ce0055e0f7ff9cc503b5088b7887b69c0d240ac
126 Risk Score

Malware Insights

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

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 0.9996

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://ponafet.ru/award?keyword=anthrax+disease+in+cattle+pdf PDF link annotation
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/5397289.pdfIn PDF document text
    • https://malekijewa.weebly.com/uploads/1/3/0/8/130813883/wirexebudone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417128/normal_602282e6e5a4b.pdfIn PDF document text
    • https://zelogevoge.weebly.com/uploads/1/3/1/4/131483318/7219453.pdfIn PDF document text
    • https://dilazewinu.weebly.com/uploads/1/3/0/9/130969594/78b74915.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_5fd175c215fff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_605353891d3ed.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/PEmiggj/battute_da_buzzer.pdfIn PDF document text
    • https://panusefebile.weebly.com/uploads/1/3/5/3/135331690/sidunevabomusi-makip-lenuva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413866/normal_5fe623c156b30.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/abjcihd/39748565765.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/1a4292e1-ef82-4d26-acc1-53c22da4bdab/loruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffa6aa42-86c5-4720-b964-c6a83b91b599/touch_of_class_promo_code_january_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a1dd4d7-0668-479b-99a4-17c0c126cf8b/bakolafogur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5870c7b-d2f3-474c-a36b-482794f13f12/how_to_use_photoshop_cc_2015_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15a8f625-d67b-488d-b67e-3f2e14ab81d3/how_to_be_average_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fec6cc-c9be-4290-b5c9-374effe9aa6a/rodoniveteta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c882111c-e4a5-4c95-9db3-2d7b0e77cff2/what_types_of_intermolecular_forces_are_found_in_ch3och3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803803a1-d1d3-41de-b7d2-e60ba3e8db4f/11445360265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481736ad-0f49-4b51-b303-bed3145c377e/gta_v_3dm_crack_v4_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fbab71-cf79-47d0-9f2c-a1731a4974b1/sample_size_calculation_formula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02914f8-a91a-4df3-9925-77804823c794/how_can_you_prove_light_is_needed_for_photosynthesis.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_off0000fb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB86 5300 bytes
SHA-256: 38ab322759356697a07ea331d9743ae415710ea498781bd3de8a573f94c6045a
font_01_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 10544 bytes
SHA-256: 0896731e913caf2275e9da06473c4a61a796162201a428d2a6ac4b9f4f8176c4