Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c54bdad371484c7…

MALICIOUS

PDF

75.4 KB Created: 2021-04-04 14:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0a0911d99238b7d85abb1d4e85582445 SHA-1: 542df28b5d06dde1e4ba8a1c73fcd9477b21391e SHA-256: 0c54bdad371484c7b77cce05e5f0c629f4f9ff2b8d2e5bd7a28b8c2b17b3a2e9
226 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. It uses a password-protected-archive lure. 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 0.9992

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://midufefew.ru/strik?utm_term=resistance+bands+workout+for+legs+and+glutes PDF link annotation
    • https://foxisejolod.weebly.com/uploads/1/3/4/6/134626470/merewakovevovejiniri.pdfIn PDF document text
    • https://wofexajolevesi.weebly.com/uploads/1/3/5/3/135302186/4086686.pdfIn PDF document text
    • https://cdn.sqhk.co/zofagopipowi/xghhi88/gavugarijagerozakesi.pdfIn PDF document text
    • https://kezuvuxir.weebly.com/uploads/1/3/2/8/132814306/wigatijujowebomexudo.pdfIn PDF document text
    • https://cdn.sqhk.co/lumozupa/VhiMjgM/50458900317.pdfIn PDF document text
    • http://bisolivagamego.22web.org/what_is_the_chemical_equation_for_anaerobic_respiration.pdfIn PDF document text
    • https://rifijilaguselud.weebly.com/uploads/1/3/4/8/134846829/2305614.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/higdKjg/business_travel_and_tourism.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • https://selamosufuk.weebly.com/uploads/1/3/4/4/134463567/gifatevodir.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/03a86153-2e9b-4266-8f8c-64d1d61c8e42/kiffe_kiffe_demain_doria_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/828ec176-3448-48fe-a11c-1085337718f2/does_cvs_sell_blood_pressure_monitors.pdfIn PDF document text
    • http://ralabok.epizy.com/ese_2018_answer_key_upsc.pdfIn PDF document text
    • http://lubozogemodusa.epizy.com/lenak.pdfIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_7678d5a6ba8c41b1bd7eec89ea4c129d.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_0e3ecacd25664a468c40d543a14010a1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/993540ef-d12f-4812-bbd1-92132aaddf47/88794583992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8175754d-fc5f-45d0-9d72-5ac1eccbcf6d/29583221464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d4e4b27-0402-4f41-8fbe-a104ba49b14f/34421171333.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_a483f9d1cc624c14b16677ed5515a49a.pdf?index=trueIn PDF document text
    • http://vigukesege.epizy.com/wholesale_aluminum_diamond_plate_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3fddf4-6b88-457f-95cc-d578b5308821/99209479449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab05b2ec-f5a6-46e0-8c09-7cb9c2a3e1dd/which_ink_does_costco_refill.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_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5492 bytes
SHA-256: b969d72a964b9697c033d684d7c9bdf640de20405a1e355124362454b835c8cb
font_01_sfnt_off0000fc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC40 10280 bytes
SHA-256: b2eb1be8a456bd185fc88352da93345cef4946a8e18c28576add1e6cc60043a7