Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ffb26c183dc634…

MALICIOUS

PDF

78.4 KB Created: 2021-04-03 00:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 54f0700f421fd9b65e1a555123d15370 SHA-1: d3856cc51e3bab01f7ae5424453bcc352f3647fb SHA-256: 39ffb26c183dc634faff0f824e0d3634b6768d493308293cbe7202b516f71bb5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious websites, such as the one found at 'https://xezojetit.ru/strik?utm_term=ryobi+14.4v+battery+charger+manual'. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://xezojetit.ru/strik?utm_term=ryobi+14.4v+battery+charger+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457857/normal_602b4bc7671cf.pdfIn PDF document text
    • https://nozezekotelipub.weebly.com/uploads/1/3/4/8/134883262/9712f2ced159d.pdfIn PDF document text
    • https://tumupapixukuju.weebly.com/uploads/1/3/4/8/134852222/vasizuxu.pdfIn PDF document text
    • http://organic100.fun/pikilarazirufunolovboo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480187/normal_5ffa4556acc70.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469623/normal_5fcc455e7ccc5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462986/normal_5fe4f4fad71ba.pdfIn PDF document text
    • http://krokoboko3.xyz/fundamentals_of_physics_extended_10th_edition5ytxv.pdfIn PDF document text
    • http://tomandbxof.site/44238984080rdkz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467561/normal_6057ddc0da52a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_6040e341d45f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422620/normal_5feb185600752.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5ffadbb9c2145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489977/normal_6029e368f0136.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In 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/e5b57b8c-8ddd-4d25-8dc8-8415f369bc82/70435061981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7725a7e-be58-4cfa-be96-c895b1b1535e/basic_html_css_javascript_template.pdfIn PDF document text
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_b96e6694ba2b45d6bf24fbb05a418f21.pdf?index=trueIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_e0473c6f9f2d428b98ef3a96600e3aa9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/63662468-07e6-4aae-a982-dc2fe76495ae/delonghi_ew7707cm_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f493205-719f-45ec-81af-4763b5e419d2/wahls_protocol_dinner_recipes.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_off0000ecc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 1724 bytes
SHA-256: 1af1fdb02f150e4b7fb9ab825036f356033ef8d1f6adfeb519aebbff9637efeb
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 5516 bytes
SHA-256: 9568e2ff183a58d18cb4ca3858a6507ae1b486d0cc0e1b38319b96923119c2f8
font_02_sfnt_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 10016 bytes
SHA-256: e02f06aeefaff7139ec16dfb23e8159b6294f3e27a303ce057c711c355d3980b

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