Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3933b7424f4da4…

MALICIOUS

PDF

99.3 KB Created: 2021-04-16 01:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 703062f99047125979240210d810b74a SHA-1: 1227339fc6ca1b283cc6db1a938e680e3c8466f5 SHA-256: 0f3933b7424f4da4157e067f4e2f3b57583c2afee0b0587ef73ae20b8c004ae8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://ponafet.ru/strik?utm_term=historical+development+of+the+concept+of+life PDF link annotation
    • https://cdn.sqhk.co/xopuwomu/7dNA2gc/85108966630.pdfIn PDF document text
    • http://potozafit.medianewsonline.com/ccnp_data_center.pdfIn PDF document text
    • http://cosmicgig.com/xuvegun9862.pdfIn PDF document text
    • http://lolebunefa.iblogger.org/how_to_connect_merkury_headphones.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/icjdqja/rebudakixotumadabadu.pdfIn PDF document text
    • http://vitetoka.scienceontheweb.net/52754058267.pdfIn PDF document text
    • http://rentline.pro/nawetoriwinipunuztqva.pdfIn PDF document text
    • http://pokemonrivals.online/what_is_an_sbir_grantg3ucn.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/b80c8958-7533-4b47-b7db-4c5cfb9bf0dc/ridopagosifofu.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_59e56a7c7ae5479695f7c1104ff1fb7d.pdf?index=trueIn PDF document text
    • http://mujaxeb.rf.gd/osaka_train_map_guide.pdfIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_6fdec5e945234f45809f0897b77a6afa.pdf?index=trueIn PDF document text
    • http://dawozisi.rf.gd/formato_de_solicitud_de_empleo_para_llenar_a_computadora.pdfIn PDF document text
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_8b94fb7c06b74a1ab1096804713a42b0.pdf?index=trueIn PDF document text
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_15c47dbe6fe0459e801ff427c69f023b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04459aee-a28b-480f-9f6c-52cc596ba247/66345040300.pdfIn PDF document text
    • http://soriwolawiri.epizy.com/80559046854.pdfIn PDF document text
    • http://nojikigor.myartsonline.com/44745311182.pdfIn PDF document text
    • http://vuxupib.epizy.com/himno_nacional_mexicano_version_original_1854_letra.pdfIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_d7296d08800748f79f593dbf524ca93d.pdf?index=trueIn 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_off0001490b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490B 5416 bytes
SHA-256: 27f838ddf0f5975e7aa5ea7500c2fdcf6bf690f54a2c47db373ebdca01d8edee
font_01_sfnt_off00015b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B51 10744 bytes
SHA-256: f7213d908d288d437d26dbcedcff4e11c50a381bacac19159cf257868d2dd9fd

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