Malicious PDF — malware analysis report

Static analysis result for SHA-256 6163434949515bfa…

MALICIOUS

PDF

84.3 KB Created: 2021-05-04 10:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c205cb07c8855e06788d945c938e1774 SHA-1: 22e34540703bc09842bba64d1bfe81da7f8aa3b4 SHA-256: 6163434949515bfa830f3e98957bdc7cc2eb4685938c4cf18336868cfa176821
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs suggests an attempt to lead the user to a malicious site. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-luring scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/strik?utm_term=fundamentals+of+physics+extended+11th+edition+pdf PDF link annotation
    • http://nanolenka.xyz/the_photography_of_modernist_cuisine_download5v758.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/vuwekaje.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/ghvibhh/shogun_method_book.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/62253996044.pdfIn PDF document text
    • http://matcobzor.ru/61189878824e8h26.pdfIn PDF document text
    • http://zathkatow.xyz/sutifobakitokubopao2338.pdfIn PDF document text
    • http://myyshooop227.site/equifax_credit_report_narrative_codesfb2o3.pdfIn PDF document text
    • https://cdn.sqhk.co/dizirajeb/1xWjh3g/advantages_of_external_style_sheet_in_css.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5ff77472d1c52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_6065dba216e07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_605e1384a2819.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/tdqhaYg/world_exploration_trends_2019.pdfIn PDF document text
    • http://repair-kompov.ru/recaro_booster_seat_reviewcqwye.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/cooling_tower_design_basics.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/megowifob.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/36288560510.pdfIn PDF document text
    • http://bbflowers.net/lopefosig6sq1.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/95460206393.pdfIn PDF document text
    • https://cdn.sqhk.co/woledibiroju/gC89gdQ/nenud.pdfIn PDF document text
    • https://cdn.sqhk.co/juselivo/cgjgdha/heroic_definition_francais.pdfIn PDF document text
    • http://titoto.xyz/bupilcygm5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://moxadokikubod.onlinewebshop.net/vavatexizatuz.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/55575153921.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_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 5476 bytes
SHA-256: 611905f75ba8502823c4749efb696cfa5d5e260fe28364c0be9f8d9fcab214b9
font_01_sfnt_off00011a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5E 11552 bytes
SHA-256: 462eb3373872085f4166a9899eb7f30f79c977cd445f12e1be27735cd8221dde

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