Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95df202f7755495…

MALICIOUS

PDF

68.9 KB Created: 2021-02-23 20:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a77bdccd0e8c669f1020cd71c9b77e2a SHA-1: 2e328b7b3c0ed004de9ae75eadb5f611041f695d SHA-256: c95df202f77554959e91a071b646ad9ca19d6986b292d77bbd748daa0f8961e8
156 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=volume+of+a+triangular+pyramid+formula PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5fe0a36d58dea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420240/normal_601fa833bcc87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_60048377d4741.pdfIn PDF document text
    • https://magudutetu.weebly.com/uploads/1/3/1/4/131437318/varixofujuxug.pdfIn PDF document text
    • http://drenajkrasnodar.ru/8_planets_of_the_solar_system_pptm209g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_601986a6ea6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504568/normal_6020f9a721061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488817/normal_60234b6b811b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409813/normal_5ff4b79ec3a6f.pdfIn PDF document text
    • http://energierecrute-emplois.com/804439590123v1x4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478928/normal_5ff25a01712d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485570/normal_601d6c138b48d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/pipuzevesilazore.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/54374136005.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/asphalt_8_cheat_engine_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/bivafox.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BB 5248 bytes
SHA-256: 2e68309d40eb146cc446cb291dc261521d2a8d5569aa74084661cb009a1385d8
font_01_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 10264 bytes
SHA-256: c313e7fc2d1d0fdce523ee0ddcf9fa27fd9c79ecfb170037ad6e0c6b12498e14

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