Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3ff1cfaef9e451…

MALICIOUS

PDF

82.3 KB Created: 2021-03-09 01:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 442dfc042a86d50131732d9149e6773a SHA-1: ac9ee4f9a8aab7e272c77cc8108cdf1d7cd71956 SHA-256: 4a3ff1cfaef9e45161d26a2cf557dc2d6563d63d6a630a9e76a0523be70b396a
66 Risk Score

Malware Insights

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

The PDF document contains embedded URLs and heuristics indicate it functions as a link farm, directing users to potentially malicious sites. The ML classifier strongly flagged the PDF as malicious, and the document body, though partially garbled, suggests a lure related to the Spanish Civil War. The presence of embedded URLs and the link farm heuristic point towards an attempt to redirect users to malicious content.

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://xajibur.ru/strik?utm_term=famosos+en+la+guerra+civil+espa%25C3%25B1ola PDF link annotation
    • http://gelufose.scienceontheweb.net/orthopedic_physical_assessment_magee_6th_edition_free_download.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/gopro_hero_4_black_edition_accessories.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/best_scope_for_a_marlin_model_60.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/business_management_degree_online_uk.pdfIn PDF document text
    • http://pejelurim.getenjoyment.net/3380437759.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/power_book_2_ghost_episode_9_soundtrack.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/dmv_test_in_spanish_2015.pdfIn PDF document text
    • http://lakegefufen.scienceontheweb.net/puxowabegolizatekanemu.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/zelikojotisalilitaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ropuba/vebatovabigo.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/clasificacin_de_nmeros_reales_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786e361f-6665-4309-a2fe-d5301ba45dc5/danby_kegerator_dkc146sldb_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bde145d5-09a9-4091-b5a1-21de22545eae/pubojidilamukakezemib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/472ef10b-dbff-4131-9b27-28758993b844/how_to_increase_seo_on_etsy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55c9469c-5855-4cc4-a2ff-827c825a1589/lunofupawuvedusumiditokos.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/86004241759.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/1904855051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1b88caa-702a-41f3-8236-f485f3a49516/piziwabejesenezowomifajo.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/5275972383.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_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 5480 bytes
SHA-256: bc1faa792ac0eba3cc782280e70e5403aec836fa0dee7503a0c7f86e08dee7fb
font_01_sfnt_off0001147b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147B 11632 bytes
SHA-256: 7edd39292fcffddcce9b50f049f0d65d597a28d25574bad6495e137502210d57

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