Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ce30344b891d75…

MALICIOUS

PDF

77.8 KB Created: 2021-04-02 19:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9a1e7c4610f299a8dbe4ad64a41cf827 SHA-1: aeefc4de8761f16d399e8fc610beb00049e0b0c9 SHA-256: b5ce30344b891d752eff205ab797b54ec62d65cc17743f7480d584363520f30f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs pointing to other PDF files hosted on various domains, some of which are disposable. This pattern is often used for SEO manipulation or to distribute further malicious content. The presence of external links suggests an attempt to exploit vulnerabilities or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://golowaki.ru/award?keyword=tardiness+of+students+pdf PDF link annotation
    • https://zunazodofi.weebly.com/uploads/1/3/4/6/134636935/jusakenekuvofi.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/gZ9heZL/bluetooth_low_energy_supported_android_devices.pdfIn PDF document text
    • https://bowemubunewoseg.weebly.com/uploads/1/3/0/7/130739536/jokotunup.pdfIn PDF document text
    • https://mefevujeloz.weebly.com/uploads/1/3/4/3/134317202/jafiden.pdfIn PDF document text
    • http://sakhavto.ru/zulokanifupozolaburakedosl47f5.pdfIn PDF document text
    • http://uorott.com/13848432266f33x.pdfIn PDF document text
    • http://tublitalia.fun/gozakezekatizuxafewujogtfl32.pdfIn PDF document text
    • https://zejikato.weebly.com/uploads/1/3/3/9/133997407/6ba1a9ae31c26f.pdfIn PDF document text
    • https://cdn.sqhk.co/kowukogifaw/EjjMhhB/28411779964.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/jaUzge2/infection_and_prevention_control_program_focus.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/2491448.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/cfd708e9-111f-4be4-a267-012631a7bd4d/58664862908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d73a2d90-de75-4801-9afe-946e95c510d5/saxeluwotizujeg.pdfIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_e4b19a43004c4ce2a7cb1d77b0cfc1c8.pdf?index=trueIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_db579340aaa7417fa9e3a1f8d7f6f9ac.pdf?index=trueIn PDF document text
    • https://2f2ab42d-e0b4-4bd3-aa50-2430da1ff5fc.filesusr.com/ugd/eaf48f_987603cab64849d289b1ae02139034f9.pdf?index=trueIn PDF document text
    • https://1d78cdce-0032-4a75-b9f1-030f6b068c24.filesusr.com/ugd/32f660_d59173592ff64ab6846776edfd9b846b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/810f9b65-0bff-4941-850d-00ed6b3b19c9/how_to_explain_gdp_per_capita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c4c8df-e54f-4db9-8ce1-f294f17b4283/pathfinder_druid_feats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/998c3452-e2a3-43f8-b076-00d798651a9d/bexewiwudotegil.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_bd1df3b393d54fbda4d23c664aa535e5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a5b67d-45ca-4157-a7fa-35d3330aca73/5315336172.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2999a600-a302-4afa-8ee9-95f8fdbb0b4a/41396977365.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae3f6bc4-1552-4338-a1f1-f4c986700883/31897229395.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_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 4952 bytes
SHA-256: 031ea09ede9802c34affdbfb7d9a3fb81b579845663e23d6861b560beef18113
font_01_sfnt_off00010555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10555 10828 bytes
SHA-256: 0aee5ec4f3e9ce50de20f082bd9ad0343de4a5263f399b377befc6686c74d1d3

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