Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e593d177f3cc7f4…

MALICIOUS

PDF

67.6 KB Created: 2020-12-23 23:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8b60a58c21cd6577c0c2473a8f47d2e9 SHA-1: 3ae0d372260caf9abc59286edbcd1ac1ab5e758f SHA-256: 4e593d177f3cc7f402138edd250588ed792e033fccaff53617656d3e9ff45c61
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a malicious redirector and link farm, designed to lead users to potentially harmful content. The embedded URLs and the heuristic firings strongly suggest a phishing or malware distribution attempt, likely initiated via spearphishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9360

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=bulk+email+verifier+software+free In PDF document text
    • https://cdn.sqhk.co/gurukemopuge/shcwgew/mesoxefogoratukogiwuxinu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372987/normal_5fc7a6fd0e6cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384142/normal_5fad9f8548266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447267/normal_5fbdd4915c677.pdfIn PDF document text
    • https://silifasakesi.weebly.com/uploads/1/3/4/5/134510621/7060673.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/UhbVBKl/zoragobozitabodemi.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/d85d80c6-4c0f-4b1d-a084-b61b3bd0bbbf/penojexatebufiradiladopi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ec142be-e804-4ac3-a671-bce3e9a1bd30/4189769118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e859e6-4418-4933-b474-fc6c80e1dffd/21554954694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19779e8b-0303-4ac5-bad5-341091634e91/kreg_k2000_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc13ca5d-4a8a-4367-9e28-aa77d3a661cb/kasirezowadexisuzolimogom.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AC 5176 bytes
SHA-256: f4cc4e34c40566c093f5563aba7292e96344a9030809570a4f0d34e875b94bd3

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