Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d6fb05abe56462…

MALICIOUS

PDF

73.3 KB Created: 2021-01-09 09:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9b9650c99a444fd6b0857dd6948e49bd SHA-1: bd7b2f94d3baf97df7af0c3cad82c75031aadc14 SHA-256: 72d6fb05abe564622ebb4d1dc4889bc01131767b17f1c9db7ca182400a3fdf8d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, indicating a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffnew.ru/123?utm_term=is+aptoide+safe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fb2d46d85cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460066/normal_5fa1e27333eca.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/P1yjfic/nba_2k20_myteam_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5f8dd73ab8456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_5fe7a6232706b.pdfIn PDF document text
    • https://bunavomotuta.weebly.com/uploads/1/3/4/6/134606544/redakojonejugu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461509/normal_5fae8d45757c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_5fe88b7ea1064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389570/normal_5f986a2752c57.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/ef46fd9e-117c-4ff4-89d2-9646b91cc225/57983670437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1857df2-2e40-438e-bad4-5b0e382db0e4/minecraft_apk_pc_android.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_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 4844 bytes
SHA-256: b885f1704ab528881613b664ac50fba3ac9802dce99b40d1e517f6314dc8d05f
font_01_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 10892 bytes
SHA-256: a7860bbed724a61d79d29b071859d3b530d69ec6cb17ece7e15f0e8a572697af