Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e5de09ee7b85c3…

MALICIOUS

PDF

78.7 KB Created: 2021-03-04 14:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 672f7046d8f61930faf8cf2084be1136 SHA-1: 1a7b7edbc247c1d685bb34fda2676c57eaf6474a SHA-256: f1e5de09ee7b85c32cc769eeb9c4c9a962fcd3986eadda9eaf47ffe62e7b7304
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://dafemum.ru/wix?keyword=miracle+of+life+video+worksheet PDF link annotation
    • http://vazawujuzu.sportsontheweb.net/58554684148.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476595/normal_60275eeaecf32.pdfIn PDF document text
    • http://flowerport.shop/how_to_check_traffic_ticket_online_in_californiabp8us.pdfIn PDF document text
    • http://bumosid.getenjoyment.net/86795519635.pdfIn PDF document text
    • http://okrasote.info/xamorewezurasomxmwsv.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/zigowexixewemaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370744/normal_6015d84878c8b.pdfIn PDF document text
    • http://vinograd.io/tasty_101_best_chocolate_chip_cookie_recipejcnif.pdfIn PDF document text
    • http://antonioita.fun/6513259459536ob6.pdfIn PDF document text
    • http://digovin.getenjoyment.net/ny_dmv_practice_test_in_french.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_6023d6ab595ae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://24218389-b518-4ca3-8548-65eaf758daa4.filesusr.com/ugd/c836c3_f44523595b30405aa8e626128ab575bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/16efcdaa-5c32-4f27-9d77-c55f99756997/camp_x_truck_camper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcba8d62-2550-4f8a-abc6-83213be64c7a/lofesefalegaxupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25d565b6-1903-4fff-b4f3-43e294c8291c/swiffer_wetjet_wood_mop_starter_kit.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_70bcc5d30f794880bd98b2c756f4805f.pdf?index=trueIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_327e530fa42647f898614007eee56c28.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e05a536-30fa-410f-92fe-7fc61ced3f26/fogewevukemasoxolovof.pdfIn PDF document text
    • https://45f91bdd-2b68-4e60-ae2c-b14373ae5332.filesusr.com/ugd/0d089b_697bcc0d9e82437dacf633fa527e5ecf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cab72c15-416e-43d3-8e8e-11879443a18f/kubirinomivezokabem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/589a6c7a-dc8c-42d2-9204-19007ddf1589/how_to_do_weighted_average_in_excel_sumproduct.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180fb4d0-e393-4784-850c-44669560425e/77349878302.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_off0000f613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF613 5328 bytes
SHA-256: 166daada222747751ba902cac00a34c6df3f90b3384b5093ab2b507641158a13
font_01_sfnt_off00010850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10850 10768 bytes
SHA-256: cc7198dcd1fc9b3555e5b6573360a010473b2d0182dcde75c8ea2bbbfd521d0f

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