Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0192663b7bf593…

MALICIOUS

PDF

77.5 KB Created: 2021-03-11 14:33:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6b1a337658f515d8ff4cae3db5d8891b SHA-1: 41c49631dfb7b1705db377308d54b48a42a93c26 SHA-256: 6f0192663b7bf593a4251b4d7d94a156acc7a3b9d342f9a614ef370b0aa9425f
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=declaracion+universal+de+derechos+humanos+1948+resumen PDF link annotation
    • https://sumajodezidozi.weebly.com/uploads/1/3/3/9/133997227/bavekijokotax_bivin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fd8923b96c6a.pdfIn PDF document text
    • https://pisiteju.weebly.com/uploads/1/3/5/3/135314571/2163235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5fd38c6f0ee1a.pdfIn PDF document text
    • https://kumenesasewoton.weebly.com/uploads/1/3/4/7/134773405/bexamujetejuta-kafip-turetiripekinu-mobomaz.pdfIn PDF document text
    • https://suzozepizemukaz.weebly.com/uploads/1/3/4/6/134665009/effad02354d.pdfIn PDF document text
    • https://zirakamu.weebly.com/uploads/1/3/1/3/131398357/7523667.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xinirawubag.rf.gd/a_balanced_introduction_to_computer_science_3rd_edition_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e55dc02-f94a-4f3f-a9aa-3824d07e318d/directv_genie_not_working_in_one_room.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fe9955-ca5d-4b7f-af70-5112562567b6/56934661028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/982f24d2-d00a-4375-bcd7-8ecf8cefe6ad/26951737476.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/58700973888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e832b5d1-3de1-4fb3-a125-83c2d6925c84/polaroid_sun_660_value.pdfIn PDF document text
    • http://mimiruwonaru.epizy.com/breakfast_at_tiffanys_restaurant_nyc_reservations.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/norelco_9000_series_replacement_blades.pdfIn PDF document text
    • http://pobiludorigogok.epizy.com/49515046852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/424066b1-9682-4ef0-9e57-7d6b79d11144/how_to_see_where_page_breaks_are_in_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c597dd-29e1-4b37-a692-8ab505c9c27b/theory_of_relativity_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0cd6b7c-d913-465f-a3b6-bc72d832cbfe/kexiki.pdfIn PDF document text
    • https://s3.amazonaws.com/bupesejirijejus/ambito_educativo_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36a35400-bb9b-480f-93d2-5fe0f97704ed/how_to_use_a_black_and_decker_12v_drill.pdfIn PDF document text
    • http://sujabugepebizud.rf.gd/what_is_the_best_diet_for_inflammation.pdfIn PDF document text
    • http://redubemupaluk.rf.gd/44266772448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be3e63a9-4213-4911-b726-eff6215e28ad/is_the_green_mile_a_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24f720b1-2f4a-4e34-8b59-682a237d8f93/90529796677.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_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5728 bytes
SHA-256: 8ee8275dca3540aca5efde2c2aa23948f0bd477d8156f3dd69ea40687d4a98b3
font_01_sfnt_off0001048c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048C 10416 bytes
SHA-256: b2d454286fb517062f69ac6ece086c67813a8a484db70f6c04e9b30bf20a3b0b