Malicious PDF — malware analysis report

Static analysis result for SHA-256 536a4a700d90b010…

MALICIOUS

PDF

74.9 KB Created: 2021-06-02 04:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab567768ec2c2b3af434b4d456294629 SHA-1: 515c1b3bc51d8e69d355d29094d9051dbb6e61d1 SHA-256: 536a4a700d90b010ad38c3d79d337c53eee649c29af64c2f53b68ee92f78550b
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 0.9993

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/wb?keyword=how%20to%20adjust%20time%20in%20casio%20watch%20db%20360 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445882/normal_6049aa0b6ea02.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/sevuzadomepamagadami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380545/normal_603eff5a82eb2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367937/normal_5fd69ebd3347d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472501/normal_605c3682408d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380080/normal_5fcac8d8826cf.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/7402553.pdfIn PDF document text
    • https://pimanubidaw.weebly.com/uploads/1/3/4/3/134353005/7226777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378379/normal_602d9387757fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416927/normal_601fcf27ee7a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393208/normal_5ffb7082d32f0.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/21e87d9b-cc8b-4ff4-a2dd-276c899ba6f0/duripenipuwebasamu.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/how_to_get_fnaf_sister_location_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a592910-0058-4e44-be4a-43e60a20ea45/boy_in_striped_pajamas_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165dfa9b-b239-4d12-b195-479e1deb1188/what_is_sap_hana_for_dummies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428a5bf3-ceb1-4d4d-a119-7f3ba9c08c60/xozirebobirof.pdfIn PDF document text
    • http://pimepovume.pbworks.com/f/98433982759.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb178b0-9b8c-4aa9-b2be-0fd85cd4f8c7/67541080512.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ac5956-77c1-4b12-9a1e-c86b13c1aa3c/20361674108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9140594c-daf1-4148-9e70-6d161ada1dc6/the_collector_store.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b4fc1e-bee4-4138-a8c1-c7a378484a0b/graph_theory_in_mathematical_foundation_of_computer_science.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/wolfteam_bedava_nakit_ekme_2019.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144483933/how_to_uninstall_asi_loader_gta_5.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_off0000e6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D0 5780 bytes
SHA-256: 0eb9202ec676a48814a016df70469d382d954a637505473f6fb57f4f925f074f
font_01_sfnt_off0000fa66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA66 10460 bytes
SHA-256: 13a96575e02d9409254998e3c5a58efcd5863d8e76cf7a08cdce03173cfe1c3b