Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e86648bfc50b1a0…

MALICIOUS

PDF

65.5 KB Created: 2020-11-14 01:19:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: fb1cb8026f7b2c41e220f8b7929727e6 SHA-1: e04be8bb0116a51cefd0d1702f5fee6e058edbe7 SHA-256: 5e86648bfc50b1a0f931edbffb763d0f4311da54d7145c38b62a690d3aed4e43
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The embedded document body, though heavily obfuscated, suggests a lure related to a 'case study summary'. The presence of a malicious URL and the ML classifier's high confidence score strongly suggest a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=build+a+bear+case+study+summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403954/normal_5f977efaa3264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422168/normal_5f9f08b8931c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419846/normal_5fa66c854a569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383928/normal_5fa5bd32a6d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5fad5ac350fc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388835/normal_5f9b79fe3e30c.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/ca666ce1-46f1-4943-9799-fe5624f9ac6d/26813913609.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/53804982042.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9683f2e0-43f3-4e3e-bddc-bd64fd95b182/53707163631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127a8a6e-c5d2-4b53-9bbe-29f1c1872997/sifewotiwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f93469e-8137-4462-bd46-f2d6bffa7b43/73111751421.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/ceiling_fan_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3c7027-4a0f-4d10-b043-6bf33b2dc98f/29565370970.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_off0000c610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC610 5376 bytes
SHA-256: a255d414586b8f3cf2b73afa719bbd58f37942a7614954e9303259ffcd357dac
font_01_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 9604 bytes
SHA-256: 3782f7b9b0ea426dd41b212b1f6462cff8fffa7fc8402d48c77e88a482cb2c4f

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