Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb956ab95b1a38d…

MALICIOUS

PDF

78.4 KB Created: 2021-06-03 00:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 653a7ab6fd54904645a3d84b3713c0de SHA-1: dd0d6c6687bda88740f07f5df7845c667f32584a SHA-256: efb956ab95b1a38dcdf7632f75b5f05865e20768ab6d56c241c3ecfd83476d8f
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 0.9992

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://fokemale.ru/123?utm_term=list+of+disney+animated+movies+free PDF link annotation
    • https://telavepifamika.weebly.com/uploads/1/3/4/3/134352802/5346121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_6069e03136043.pdfIn PDF document text
    • https://pepotoxuxomupav.weebly.com/uploads/1/3/1/4/131483830/rugizukujukadid.pdfIn PDF document text
    • https://wemavepudobug.weebly.com/uploads/1/3/4/1/134108610/2154158.pdfIn PDF document text
    • https://boxotajisosuni.weebly.com/uploads/1/3/6/0/136086252/dorutaboj.pdfIn PDF document text
    • https://gatobutapasi.weebly.com/uploads/1/3/4/3/134364099/getonuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466151/normal_604992ef96061.pdfIn PDF document text
    • https://tebelusagunesaz.weebly.com/uploads/1/3/4/3/134318259/fokarepelipewuzi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470400/normal_606b6a5c8587e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417815/normal_5fdaf544dbfe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_603e42dc3d715.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/f1e78d76116319.pdfIn PDF document text
    • https://jazasamiwuri.weebly.com/uploads/1/3/4/8/134889091/jetojusu.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/8d01bd80-c5da-4c90-b97f-256c378fb762/63630473112.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd55b330-38fe-4ef1-a740-b607cb53037d/xeneb.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/robosuteposovarukajoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c50dd00e-67fd-4e4b-a3c0-d468e8662190/how_much_do_software_testers_get_paid_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf84bca-902e-4cb2-8deb-4495122cbd76/honeywell_visionpro_8000_installation_manual_th8320r1003.pdfIn PDF document text
    • http://lagawiwefe.pbworks.com/f/how_to_install_cores_retroarch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b496f786-d2e0-40a7-be6b-16e99ee285cb/core_python_programming_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c21795-aa6d-4ae5-a6ba-cced30486cc1/mamufezarepapepepoguto.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144427575/octal_to_hexadecimal_conversion_questions_and_answers.pdfIn PDF document text
    • http://demopefo.pbworks.com/w/file/fetch/144528780/wegowabup.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_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5124 bytes
SHA-256: 548da3198e207a1cd0580e37f72c7dff0352eb627cd04e3c7419a336f8663450
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 10944 bytes
SHA-256: 6faab9d743401ba532363a6e176692021877e7f4975b924aa24db4675fef261e