Malicious PDF — malware analysis report

Static analysis result for SHA-256 975e10a8fa99058e…

MALICIOUS

PDF

99.1 KB Created: 2021-03-04 14:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4981f347ed34bcede6efa593dcd2d525 SHA-1: 3629cc582852e1a6512ad92187764cde31381d4e SHA-256: 975e10a8fa99058e778d4f2d17f3ba45a7e74c9b2cdce440335230c4e6073576
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain that appears to be a lure for search engine optimization. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests a link farm or redirection attempt. No scripts were extracted, but the PDF structure itself is suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://xajibur.ru/award?keyword=what+is+the+pass+rate+for+the+colorado+real+estate+exam PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420906/normal_5fd07fc6853d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378152/normal_600fbb987eb96.pdfIn PDF document text
    • http://electorat.org/bunny_malayalam_movie_songs_123musiq_comasmrt.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/elite_platinum_maxi_matic_pressure_cooker_instructions.pdfIn PDF document text
    • http://plsale.pro/que_es_materia_en_quimicargfdq.pdfIn PDF document text
    • https://fojinotumure.weebly.com/uploads/1/3/0/8/130874368/vizutarapik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454290/normal_5fe1394cc8bda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421333/normal_602fe64913c39.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/icd_10_code_11000.pdfIn PDF document text
    • http://onenature.space/airbrush_app_apkpureq0ifp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449769/normal_5fe1d317cbdb4.pdfIn PDF document text
    • https://sikufotoxatufik.weebly.com/uploads/1/3/4/4/134458503/5768403.pdfIn PDF document text
    • http://megalit-korolev.ru/nec_dlvxdz-ybk_night_modegefbq.pdfIn PDF document text
    • http://ritegifufefut.scienceontheweb.net/zerazekezize.pdfIn PDF document text
    • https://maradezeg.weebly.com/uploads/1/3/5/9/135974492/1753786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://faxiruvud.myartsonline.com/nikon_p5100_dpreview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a74a06e-49b5-470a-8a95-137ef4a8ebcf/synonym_of_safe_haven.pdfIn PDF document text
    • http://pigutun.myartsonline.com/properties_of_matter_crossword_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e11e32-7c1b-4b75-a6f9-3846a6dec21e/kung_fu_panda_3_cast_rebel_wilson.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/vamuwojorad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4af8119-4ec5-441c-94c1-e5334f0c1918/what_is_a_ride_along.pdfIn PDF document text
    • http://vegubom.atwebpages.com/95780437613.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/11680986489.pdfIn PDF document text
    • http://nufiwimuzobo.onlinewebshop.net/49697358186.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b369d3f-0dbe-41ef-b05b-a6f55fe3c5ec/how_to_listen_to_music_while_on_motorcycle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c87bc42-5b17-4e58-8fd2-a579f88c36bd/nubogonosax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13887 5160 bytes
SHA-256: 52631bfec5b80b955a5fc3f20fe71901022372f4a3646190116a4e9deebc9fe7
font_01_sfnt_off00014a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A26 11036 bytes
SHA-256: c2a9135e3860176f933027b7f67683432befe758f506406b43fd8334fa200c19
font_02_sfnt_off00016f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F9A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c