Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d6b4a18e5fd8cd2…

MALICIOUS

PDF

85.7 KB Created: 2021-04-25 23:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6f6e5a17ee87348d4bb3022362654738 SHA-1: b5c8e2068cc6281210b22a14811214f8544fd173 SHA-256: 6d6b4a18e5fd8cd2306ad02cd72557da194fcd457b4858200888eaebdfd04295
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 0.9991

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://zajinet.ru/strik?utm_term=baldassare+castiglione%2527s+the+book+of+the+courtier+most+resembles PDF link annotation
    • https://menanotiji.weebly.com/uploads/1/3/4/3/134322389/1878086.pdfIn PDF document text
    • http://habirovradik.ru/derecho_romano_guillermo_floris_margadant_descargar_gratisikd11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453719/normal_606de928a4bef.pdfIn PDF document text
    • http://itclick.pro/diono_radian_3qxt_4-in-1a041r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366989/normal_5ff58026255eb.pdfIn PDF document text
    • http://ukranews.site/1001_arabian_nights_19590zs33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472776/normal_600aa8a8d8574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409826/normal_6067c545b7093.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411937/normal_6001b7373444e.pdfIn PDF document text
    • https://buranujepexu.weebly.com/uploads/1/3/4/3/134339299/1825831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_600f00ba0107a.pdfIn PDF document text
    • http://5coupons.info/92521201652wtlxr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5fe012570c8b2.pdfIn PDF document text
    • http://ing-cliente.com/60401268957x7eet.pdfIn PDF document text
    • http://d-youtube.com/vukutusaxolozej8jlw2.pdfIn PDF document text
    • http://canlisohbetim.net/45126154959u5twm.pdfIn PDF document text
    • http://salonapp.xyz/pitovorenifafebakek7x5b.pdfIn PDF document text
    • https://raguwagoneneza.weebly.com/uploads/1/3/1/3/131384547/kufutiriguka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387590/normal_5feb6a0d30e05.pdfIn PDF document text
    • http://netewe8.xyz/94090767562oc4re.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386607/normal_603df6e8abf9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_605d6eeb13a8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://849cba27-c1c2-4801-a47f-514a08c45c3c.filesusr.com/ugd/7f7a2c_94a8da658b0c49b891c0a31cfc65a05d.pdf?index=trueIn PDF document text
    • https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_9b004d6e79e7456b863e0b76f3dd39c3.pdf?index=trueIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_bbc773c57d554a22971f03420fd18e29.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_off000111c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C8 5720 bytes
SHA-256: bb370890ea2b735edbc60da0e97bc629a71e6172c0ae12268126af423a2ecd49
font_01_sfnt_off00012522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12522 10288 bytes
SHA-256: da589c32533234bdc52f95e0aeef3e516383b149c9df5faf45e0e80e68943828

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