Malicious PDF — malware analysis report

Static analysis result for SHA-256 b577764431776871…

MALICIOUS

PDF

66.9 KB Created: 2020-11-24 00:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d3b78365690caba8f23757e1cd955c93 SHA-1: 2229bd964e91c2d349048236c9060dd3945f3f70 SHA-256: b5777644317768712313be2d4b2fb8ee9c64bcae71a50cb1d3c7eea536d7fa02
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded URLs that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious. The document body, though heavily obfuscated, suggests a lure related to 'economics today 17th edition pdf', likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/strik?utm_term=economics+today+17th+edition+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fa2213541a8e.pdfIn PDF document text
    • https://vokudaminovisuz.weebly.com/uploads/1/3/4/4/134495340/1048190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368223/normal_5f9064f54ea88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8713c6d3a5f.pdfIn PDF document text
    • https://muvesajaduxu.weebly.com/uploads/1/3/4/0/134012660/ff4d952711f7e.pdfIn PDF document text
    • https://zevejekigo.weebly.com/uploads/1/3/4/3/134374512/17adaa5.pdfIn PDF document text
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/pivobuk.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/gijasavisejo-sigajod-zutinup.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
    • https://uploads.strikinglycdn.com/files/fc4b3ff7-9bff-41c6-92e1-02db70355bd5/bamifajegulavosofixijuwe.pdfIn PDF document text
    • https://s3.amazonaws.com/potofaw/37128737167.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/2003_toyota_avalon_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ac219f-8e80-4712-99b4-e8b66f8be4dc/46829514719.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/73119983429.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/formato_anulacion_certificado_de_origen_dian.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_off0000ba2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2F 5244 bytes
SHA-256: 5f04d82a79b4e69bacbda99e8f8e28d2d93f5e29dce19f116f152848a479aa09
font_01_sfnt_off0000cbe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE9 10800 bytes
SHA-256: 4d023d9ca8d3b28e3ad1cea340a4e223339e1992ec996b5095c5bd7fc9409cd6
font_02_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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