Malicious PDF — malware analysis report

Static analysis result for SHA-256 732b81b9ae539660…

MALICIOUS

PDF

78.3 KB Created: 2021-04-12 13:07:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3ed1dc18e0811c831d734486edc7a841 SHA-1: cee264902c3db25959162bff0f9690ef57b3cca4 SHA-256: 732b81b9ae5396602c15869f9ea46c21604d34f6254a83f48c8a5753e9e6bbfa
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=accounts+payable+interview+questions+and+answers+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412780/normal_606a996295945.pdfIn PDF document text
    • http://vovavipegum.getenjoyment.net/lakakozubix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_60210a1a6f9a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466386/normal_5fede4ed6ba92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486199/normal_600d3e90382e1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://timagugovoxo.onlinewebshop.net/the_art_of_war_sun_tzu_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69369980-5d60-46db-9d34-d1760f8a1396/futigegogiwexudarilaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0494e7c9-a645-4d2b-8ebe-57a84eee3506/how_do_i_connect_my_canon_printer_to_airprint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca8cb7a7-0c2c-4fba-a67b-038a22603347/what_is_the_largest_renaissance_festival_in_the_united_states.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9077322d-c728-4fd9-8288-fdf8e5d534f9/ruwopulobowek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d50be11-8c2b-4297-a848-d7139cab6181/16762066547.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c139df0e-a682-42c2-bc68-53ffa19e4092/why_360_degree_feedback_is_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42127ddd-7ec3-4b9b-8172-7204898e0a81/75262787239.pdfIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_fa5873299cef4352b3d585276ff97e2c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d486e03-4232-4610-baea-9609d99be8f9/punctuation_worksheets_for_grade_5.pdfIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_86162ec4143d4dfc9e88c0bf5caf5b56.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f139fba-e821-4788-9de8-4d56d5a7a9f6/how_to_read_court_case_numbers_washington_state.pdfIn PDF document text
    • https://71b34470-2e60-4936-811b-9f14cb47e32b.filesusr.com/ugd/1dbbf0_51c6df1db23540628bf61d61d6739052.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/221b3fe5-32e9-4287-acda-0e78a62cacee/naxuwojikajufojexoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa2daf7a-7478-4fed-bec0-ecdccee98ac9/titulos_de_credito_principales_y_accesorios_ejemplos.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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 5656 bytes
SHA-256: 84d7d8fd21f8a0ca31b544b9f09021b66f724cac18770a40f5cd77b9393423dc
font_01_sfnt_off00010792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10792 10692 bytes
SHA-256: 2b499c1d35a8e129b0c365ce4205a0a346fa626908d99a2132efefa1b8dbf853