Malicious PDF — malware analysis report

Static analysis result for SHA-256 68239443c58fc11c…

MALICIOUS

PDF

70.3 KB Created: 2021-01-01 08:13:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: cfcbf4012fd2193467497020280af3ca SHA-1: c25272b94505e42414e8b53d7c30fdedfee6741b SHA-256: 68239443c58fc11c39e04de8be39685a08b4cab91a57b73b4c415a1c72ea3d3f
154 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://cctraff.ru/123?utm_term=knowledge+management+pdf+book'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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/123?utm_term=knowledge+management+pdf+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378405/normal_5f9353e788d5f.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/1184905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402289/normal_5f94e1cd06b13.pdfIn PDF document text
    • https://rugoxeribagiwa.weebly.com/uploads/1/3/4/5/134529694/dokab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479678/normal_5fcc48236dc66.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/6753976d-522c-4535-93f3-a0d74887b7fe/turbo_stars_mod_apk_android_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9076b8e-989f-424e-847d-c3dd60e36ffb/lomuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/393db064-0187-49b7-8739-ddac94bd8880/3217003959.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/local_community_planning_budget_application_form.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_off0000d690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD690 5352 bytes
SHA-256: 0ab99cebcfad24d181b629bd8e0e8c8a06a8b1a8db98fb4182fc49af6b44b0b7
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 10664 bytes
SHA-256: 1582f1106ec246e04578b0c5c1133c04a81ca30ebe9e4e66bd11b08dbea38bbf