Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a7c36ff035b3c40…

MALICIOUS

PDF

86.0 KB Created: 2021-04-01 19:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 73e79dc448ba6991500b4ec2a79fdd95 SHA-1: 72c725c92bae5948cad05a06af1a04a2a93e4661 SHA-256: 3a7c36ff035b3c40ea51780e39ecc6255efbd57c1207c845ce265b63d38253b9
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm for SEO manipulation. One of the primary URLs, 'https://soxebez.ru/strik?utm_term=ar-15+magazine+capacity+legal', is suspicious and likely serves as a gateway to malicious content or further phishing attempts. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent behind the link farm.

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://soxebez.ru/strik?utm_term=ar-15+magazine+capacity+legal PDF link annotation
    • http://wopizup.mypressonline.com/28561765788.pdfIn PDF document text
    • http://amandeepsadyora.com/nomigosuraroamw22.pdfIn PDF document text
    • http://idealica-ufficialeitalia.website/66889934191unjk3.pdfIn PDF document text
    • http://tavafotuzefox.sportsontheweb.net/cutting_edge_intermediate_workbook_third_edition.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/is_there_a_season_6_of_secret_life_of_the_american_teenager.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/4e557492-e3eb-491f-af9a-e4a7db3b52ea/bowflex_c6_review_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd709f2-c901-441a-8ce3-c583d05fcdad/prayers_for_my_future_husband_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c6e10fd-5250-46e0-9aaa-1dc1d7a6657c/how_do_you_start_to_crochet_a_granny_square.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e3db42a-da55-49d1-bfba-8473c89ba3b3/best_shell_scripting_tutorial_in_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3dec22b-8462-4569-b029-deae3d9bed1b/41318267623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/733b99b3-eb8c-4b73-a269-79f85e3fbbdf/how_to_change_baby_g_watch_battery.pdfIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_5c9c15879b1d4ed69227fa38e59976b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a411c34a-96cc-4c3f-8c6f-5eea73a973e0/international_development_finance_corporation_address.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9489c26c-3065-4a48-bc80-bd000bbf91f7/69152057192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fc37dee-da61-4d0e-95a7-587761132f71/le_bistro_pet_feeder_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14cbc11f-9ffa-4d53-82d8-e5a56f408655/oll_algorithms_cubehead.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_c6a261cd70294cc487c22b4e74acb356.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_51c30a93051f4fbca27281bb615b9c7e.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/xasevuxakan.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/composite_materials_types_properties_and_applications.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_off0001111f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111F 5424 bytes
SHA-256: 4076f8108db4fa499427e703f382fb052c900ab8f3bfb6684f28acd518dd4607
font_01_sfnt_off0001239d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239D 11656 bytes
SHA-256: 5f54771604cca84a112d9a1964046ed04f4196111ebe50875009fbc474240bf8