Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c43bc3c8e1e0a4…

MALICIOUS

PDF

61.0 KB Created: 2020-12-16 00:56:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 77214a495d9fc7fea0cb5c1afa384b77 SHA-1: bc899fa218d83ae2182e92d027f65aa3e9210b5d SHA-256: 00c43bc3c8e1e0a4dd2e6656c72c9da2c32c63619c226c3942c79ff16da5cf69
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is a PDF document flagged by multiple heuristics as malicious and phishing-related. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern. The embedded URL `https://trafffe.ru/123?utm_term=bank+first+starkville+ms` likely serves as a redirect to a malicious site or a landing page for the scam. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, possibly involving exploitation of PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffe.ru/123?utm_term=bank+first+starkville+ms PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4411935/normal_5fcddf6b894ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_5fbecf94d649d.pdfIn PDF document text
    • https://nebomigefut.weebly.com/uploads/1/3/4/3/134359696/6deb139a8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f9c3e6625fe5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f913385ef7b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374859/normal_5f89569325b52.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_5fc2b6797f7f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388274/normal_5fd85b8091a37.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410018/normal_5f994fe8dc813.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/7e3889df-be4c-45d0-93d1-963f8c09fc84/list_4_advantages_of_using_the_metric_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a645457-e845-438b-8d7c-d2f0ba1ac9f9/xuzuzatotekujow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d64ebcc-5e38-4de4-8540-8eca13066f30/webcam_manual_focus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24002060-4f94-4733-a5ca-d9d73a6c7434/79776057557.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_off0000b41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB41C 5088 bytes
SHA-256: 7e88f0b2a52f6a57bead8ff5ed71aecb72fa9b058dafe8895e43ef5d488cd7c2
font_01_sfnt_off0000c561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC561 10072 bytes
SHA-256: 04c6359b15ddbd938d55ae26cb6345eee67b86fb490ece94f7838cfbcaddae85

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