Malicious PDF — malware analysis report

Static analysis result for SHA-256 504a1ef360528589…

MALICIOUS

PDF

77.5 KB Created: 2021-05-01 07:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c77a17bb85fa5de43573d474af077f20 SHA-1: 22e4cf276dbeae0b541c79effedc76e74d550663 SHA-256: 504a1ef360528589c6ba1c99866697f696eac3a7c95140891495fd3bce3b55cb
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' in one of the URLs further supports a phishing or tracking objective. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=what+is+a+normal+state+of+mind PDF link annotation
    • https://cdn.sqhk.co/bomoxale/hgCf1if/nijukibala.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/6326216891.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/8c73167f4d.pdfIn PDF document text
    • https://cdn.sqhk.co/xobanozizesa/vjfDIAF/26231559679.pdfIn PDF document text
    • http://xufopizaxeto.medianewsonline.com/action_research_in_education_stringer.pdfIn PDF document text
    • https://cdn.sqhk.co/tijaxasazuwi/Swiiyja/82019585932.pdfIn PDF document text
    • https://cdn.sqhk.co/rifarako/iJ4mgpO/futurexisaluki.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/20219468806.pdfIn PDF document text
    • https://sokirokesavosa.weebly.com/uploads/1/3/4/9/134901907/3197957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407733/normal_604cb54a59f49.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/0ZAhjw8/sivomami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367290/normal_5fe45ddd73451.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
    • http://kaxuwenewutexu.myartsonline.com/the_2020_bethesda_system_for_reporting_thyroid_cytopathology.pdfIn PDF document text
    • http://najexenij.onlinewebshop.net/protein_structure_and_function.pdfIn PDF document text
    • http://dolanuvusipegu.myartsonline.com/convenios_internacionales_definicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f491f3d-e6fb-40a6-b1db-28d6ac369b4f/60964119412.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8ecaf5-7d2f-4e03-81d4-98992df2a0d1/782464231.pdfIn PDF document text
    • http://pezamax.myartsonline.com/dd_wrt_routing_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d1f4d6d-5a40-475e-a8c3-eb3a2939b398/19709422627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0174512b-e057-4faa-a635-24e50af205af/how_many_calories_in_a_taco_bell_beef_soft_taco_supreme.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/cara_belajar_bahasa_korea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d75e432-6f95-4763-a212-80154db7d912/1423389374.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_off0000e4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F9 4948 bytes
SHA-256: 8a430926896345666022c4174aef217f896612f477ad394696085f7d5acdc73c
font_01_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 10876 bytes
SHA-256: 61362666a1d10cbd098fed74c338c5c0623419ecf9a931170b6a8bec0fa29d4c
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333