Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a47461c8a4c7c8…

MALICIOUS

PDF

77.5 KB Created: 2021-05-14 14:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00354ad682123c9abd4ed6042b05a7d8 SHA-1: 137506311cae94a4a603466bbfcf675ae223294f SHA-256: 31a47461c8a4c7c81e52cfcaf9661e22e8a01924cc0221ea40e07de8b4736fe4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt, likely leveraging embedded JavaScript for execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wb?keyword=history%20of%20the%20united%20states%20documentary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454179/normal_6066a50e5bc3f.pdfIn PDF document text
    • https://pipilebigomido.weebly.com/uploads/1/3/4/3/134372346/sugilabitoberom.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/ybgeghu/racing_in_car_traffic_driver_ski_accident.pdfIn PDF document text
    • http://pristav.pro/jebosoxuposero885.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/ghw9eje/94931924181.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480402/normal_6067d3c34f18c.pdfIn PDF document text
    • https://cdn.sqhk.co/dilizilozok/ujcjfvt/99622297150.pdfIn PDF document text
    • https://bosesabefo.weebly.com/uploads/1/3/4/3/134362720/5306377.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/mipatovemiti.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60183efa3d619.pdfIn PDF document text
    • https://cdn.sqhk.co/vavetiset/b6Shahd/enlace_quimico_ejemplos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484118/normal_60620c13a5492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412174/normal_601b3caac10ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466135/normal_5fc79cca28919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367268/normal_5fe81a1d1ab5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_6058ec1fe63f4.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/vemita_gizogojaru.pdfIn PDF document text
    • https://cdn.sqhk.co/zaniridut/jajhaje/50397894638.pdfIn PDF document text
    • https://zogumunatol.weebly.com/uploads/1/3/1/6/131636745/dizabedutudiruwijevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5fca12a8e09a4.pdfIn PDF document text
    • http://bitcoinov.site/weight_training_program_for_female_beginnerslwn49.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371790/normal_600274579426c.pdfIn PDF document text
    • https://lewimovi.weebly.com/uploads/1/3/4/3/134311482/sawabupus_jexiw_ruxakavib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF230 5292 bytes
SHA-256: 40f30edc45da140f0ca0d0400465197974d10f101961f2128beb1c2cc52128c4
font_01_sfnt_off00010409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10409 10628 bytes
SHA-256: 8366abe0ac1a66d80e6b4f00f7067ea0552f56fbc80d66df8370d52f84e2b0ab