Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3974feaff1c94b0…

MALICIOUS

PDF

84.7 KB Created: 2021-06-04 21:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1e5c63b38377d9736749e7674a70cb07 SHA-1: d2d2ebbf1b06ac8876e1ee0aa8ec591037543b07 SHA-256: c3974feaff1c94b0201a5b4cc3c988c8b7bb01025d928e258cc7eaa792e7865d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/123?utm_term=professional+development+plan+template+pdf PDF link annotation
    • https://ponuxarazuzega.weebly.com/uploads/1/3/5/3/135328107/rozibakuzosul.pdfIn PDF document text
    • https://watepiwod.weebly.com/uploads/1/3/2/7/132710700/71d325.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/822c7fb7f.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/selegumeda.pdfIn PDF document text
    • https://kisofoga.weebly.com/uploads/1/3/1/3/131383553/vuposisoxinepoburuzu.pdfIn PDF document text
    • https://nikudedixipapun.weebly.com/uploads/1/3/4/6/134692686/94230409830c.pdfIn PDF document text
    • https://vegebawijinewer.weebly.com/uploads/1/3/2/7/132740558/kibimefotok.pdfIn PDF document text
    • https://zozutogumudeke.weebly.com/uploads/1/3/4/4/134440166/1c2e5.pdfIn PDF document text
    • https://xijaxerunoseme.weebly.com/uploads/1/3/4/3/134306079/duferoremasipa_kexojof_pudapireziza.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/dejinoxub-jizifajazamo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/73c44be2-bdda-42ba-9115-69bc0554a6f9/verbos_regulares_e_irregulares_en_ingles_para_nios_de_primaria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82758921-1cbd-4817-b15f-35487288e7c7/how_to_use_nikon_fg_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848e5757-c3e9-4fb0-bd73-3045993e83e5/rodevubufodofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9fec7a-e43b-4009-961c-778fb5f25779/the_tempest_2010_full_movie_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd5ffbd1-d3cd-48d6-bb30-6dfe84edc413/dafibuvojewovafowadugafun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6a14c1c-615c-4aae-865d-03cf2dbd2a2f/engineering_physics_objective_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca10a665-6a68-408a-b0fe-8fddb2f5410d/16509823312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f255130e-d5ab-460c-8d40-bfcb816e3484/lusadalivugewajada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0020ae86-3f76-4ece-adaf-41b743425b27/how_to_adjust_a_briggs_and_stratton_11_hp_carburetor.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_off000101e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E3 5036 bytes
SHA-256: 97e945a34d371da6b85534628cb86928dae9d4acaa003f1349d45ac18b3950f4
font_01_sfnt_off000112e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E5 10688 bytes
SHA-256: ffe54659db99f4e0d0a4da089d473411c15dabc142d33ff77a5dde4c39339f8d
font_02_sfnt_off00013767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13767 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333