Malicious PDF — malware analysis report

Static analysis result for SHA-256 578a1ccd77fa4871…

MALICIOUS

PDF

79.1 KB Created: 2021-04-02 03:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 870693b5299dd4aac13149128440c79e SHA-1: 9267cd2c6bfea745b1f3683f30229608cb59697b SHA-256: 578a1ccd77fa4871eaaab4c0fc8d7f3f0dddb046c88013fd11bb9a8cff318e39
66 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 0.9998

Heuristics 4

  • 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://xezojetit.ru/strik?utm_term=sir+gawain+and+the+green+knight+literary+analysis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4389821/normal_5ff99619230d6.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/3bba6.pdfIn PDF document text
    • http://putededojijubo.iblogger.org/manual_sheet_metal_bending_machine_south_africa.pdfIn PDF document text
    • https://kikafizujugu.weebly.com/uploads/1/3/4/0/134012642/7e4261ba6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486758/normal_5fcc4fada9274.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/35c7050b-66a0-4816-aa9f-6aa672bfe2e2/yard_machine_snow_blower_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5b5219a-d6cf-4307-91ed-6ffeafd672fa/44527625485.pdfIn PDF document text
    • http://juromozupipoju.rf.gd/boost_converter_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb20a6cf-5cd1-469f-a99f-2d6ae7fa8451/54713965943.pdfIn PDF document text
    • http://pinijinubeseza.rf.gd/zizubiwamapose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f738d30c-a7f4-4527-b210-33584debb984/69377855191.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5003bf82-4e04-4d28-8b3c-4bffce901faf/82855778711.pdfIn PDF document text
    • http://tatuzukokamowa.rf.gd/annual_report_of_apple_2020_17.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/238d2f17-357e-442b-9afa-34be9fc2c0d2/how_can_i_check_my_post_office_ppf_balance_online.pdfIn PDF document text
    • http://wamovesomawegun.rf.gd/zedusumefowutoniwaparawaf.pdfIn PDF document text
    • http://vijamutekaga.rf.gd/spanish_direct_object_pronouns_questions_and_answers.pdfIn PDF document text
    • http://mufozugiro.rf.gd/twitter_video_er_plugin_firefox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c50c98-3615-48c9-aa73-9784cf25510d/twilight_breaking_dawn_part_1_collectors_edition.pdfIn PDF document text
    • http://lunurubu.rf.gd/fl_studio_macbook_air_download.pdfIn PDF document text
    • http://zosajirigo.rf.gd/channel_tunnel_freight_latest_information.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_off0000f4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A1 5448 bytes
SHA-256: 3271444d13c1ae4f4fc6c6ec4772d7652610fa3c019909ede6231b70299e7d18
font_01_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 11084 bytes
SHA-256: 1edcf85bee5dc56430890f81d710d53625f4114537ccf603118817c64b1c8794

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