Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf97c2de9559d1b…

MALICIOUS

PDF

83.5 KB Created: 2020-11-09 22:42:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 691552fdd0369bb4a28bcaaa3e11519c SHA-1: df7189e308fc6edc3595e50309280f1ea841ab27 SHA-256: 6bf97c2de9559d1b933c1b3f575a96760f6ba52e2186c6bc1cee585d453218d4
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • 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://cctraff.ru/strik?keyword=aisd+calendar+2019-20+austin In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426424/normal_5f9908062f8a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f94913619b37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_5fa7c1a11360f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_5f98fcaf48545.pdfIn PDF document text
    • https://solupezonideb.weebly.com/uploads/1/3/4/5/134597414/3905951.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_5f8bf88001974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422622/normal_5f9e09620221a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426571/normal_5f99b0090053a.pdfIn PDF document text
    • https://kusebedanosude.weebly.com/uploads/1/3/1/1/131163667/dipuvozezu_timubafo_dojagatelige_tawotose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444622/normal_5fa769df58708.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/9b0d691e-4f10-44bc-812f-d43e08292096/73009751098.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fccfb089-c12c-4b58-8a48-006fadb552bc/vapexixip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf32c2a-9481-4efa-b571-c888db8ed379/98405980275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1ea0d6c-976e-4afb-8ad3-b1c0022de6a4/1463735561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55607193-fab1-4bcc-a1c6-a7b19872e08d/tipo_de_rosca_de_una_pila_de_tornillos.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 4688 bytes
SHA-256: c0b7592594d9b97223cafce419e53098a5e17ed6f71e41648be1ab4945ca6696
font_01_sfnt_off0000f4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CC 5436 bytes
SHA-256: 2552d555850c8e8b9c6a2b7209c7c656cfba0517e13640741f39adb8a40d40d7
font_02_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 2140 bytes
SHA-256: 49dddaa543544930169c80d10742cf71a10a90771d945bdf421e53748b1fa594
font_03_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 13336 bytes
SHA-256: 4567a9a5955dbdc2e1f3eb4b61e1bae2df202aada55aa7990b39128d9a50e6af

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