Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73c35d17cfb3991…

MALICIOUS

PDF

181.7 KB Created: 2021-03-18 14:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f114853488ff4280f8011c2cd430428d SHA-1: 0840ec183c869d7d35a858df63b42c5ef1cb611e SHA-256: d73c35d17cfb3991e1231a422a06d432c40ba0c732c7d0b03171ceda9238ac87
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with at least one pointing to a domain associated with link farming and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to obscure the true destination through redirects and link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/123?utm_term=java+application+programming+interface+pdf PDF link annotation
    • http://zudepogumo.medianewsonline.com/lasisat.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/bitcoin_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/jjBx2p4/refoge.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/rilefilasefa.pdfIn PDF document text
    • https://cdn.sqhk.co/fegibidizog/liPiixR/94098619140.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jhBe7Mw/street_fighter_super_fighters_apk.pdfIn PDF document text
    • http://nikibolerobika.getenjoyment.net/suwamobetikabivefizufek.pdfIn PDF document text
    • https://cdn.sqhk.co/soxemudu/jghbibr/ap_econ_demand_and_supply_study_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/gifitebona/CiD8jjH/91396058261.pdfIn PDF document text
    • http://vumamanepu.sportsontheweb.net/stream_processing_with_apache_spark_github.pdfIn PDF document text
    • http://jarisudowapebi.sportsontheweb.net/sazakorinolak.pdfIn PDF document text
    • http://ginalupajeriw.scienceontheweb.net/91289946166.pdfIn PDF document text
    • http://jedilinosur.mywebcommunity.org/tinkle_digest_online_free_download.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/31861293643.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/sena_20s_evo_dual_pack_for_sale.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/0d5488e0-b5d8-4a4f-8bc5-3592997e0989/toro_snowblower_parts_breakdown.pdfIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/thank_you_maam_short_story_setting.pdfIn PDF document text
    • http://xowobovu.myartsonline.com/66820497466.pdfIn PDF document text
    • http://xomapagovujux.atwebpages.com/bibanazegosalufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc4e3c5e-4852-4f47-a27d-840c3ad18d26/bexibonobewazuvex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c94fc45f-cf9c-4e03-aa9a-c8c33a260d14/qual_melhor_curso_de_marketing_digital.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_off0000f5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A1 140328 bytes
SHA-256: 930c9551d76cd17241afa9aecb28630cf4e2e0126d62cd3c937102cadcf92ba9
font_01_sfnt_off000293f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x293F1 5348 bytes
SHA-256: 699f23d5be1eba73f9583fa028a8f91e7b6e38a9735bdecfd08e98dc888b78bf
font_02_sfnt_off0002a619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A619 10196 bytes
SHA-256: fb808cc864d678f6260bfa699fc175ccb2f076debfa3b62be3929d4da187ea97