Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb1b34b0d549291…

MALICIOUS

PDF

79.1 KB Created: 2020-12-15 07:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 18aab40ca72ece21abddbc1b2c05bc7c SHA-1: 1e285503b8a57436687e1b96aa90d928fcd51578 SHA-256: 8fb1b34b0d54929142118bc5a2e28d63fa9a460fbefd08f16226cdc64ed290f4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?utm_term=amr+new+haven+human+resources'. This URL is the primary indicator of malicious intent, suggesting a phishing or malware delivery attempt. The ML classifier and ClamAV also flagged this PDF as malicious, reinforcing the assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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=amr+new+haven+human+resources In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408355/normal_5f9243d6ed277.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5fceb3a0c3bbe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc5115d8ef7301f8b2bd077/t/5fc7b495e2dcb1274df9256f/1606923413776/83816387983.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b456d5a4-a921-4fb3-a50d-a9285c80b58a/anet_a8_assembly.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9f7805-5253-4269-b7dc-e2d604cb6739/the_boy_kings_of_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6bcf6b5-6c26-472c-b553-601dea702bef/51815642870.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35485b0d-e0a9-488e-8761-9a8327fb8419/28384932288.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78a35778af068263f1171/t/5fd6ceb2102ca46975f3fb9b/1607913138726/writing_a_formal_grievance_letter_template.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0028ac14dfd36feec75cc/t/5fc14b2b3c02f22b9d3cc2b5/1606503213679/93794668071.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec6c061e-847c-4526-9008-30e843bbd308/51451869843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b85003-d8be-49b3-a41b-f12422066a0a/64535603436.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 4900 bytes
SHA-256: 645f100a9e7fc53fe15bfb7a1cdd7a0ea1a554ecf66f3963d42aeaa10bca6b5d
font_01_sfnt_off0000fb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB73 10728 bytes
SHA-256: a5b4fa0c59fa68a36604e2a1c4c88faa27cb159035f3899630d50c16fec8c64f
font_02_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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