Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec389076d4b3cd8b…

MALICIOUS

PDF

70.6 KB Created: 2021-01-03 04:57:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: d30d9ef2ab5bf5e8afc092c5e387d9e5 SHA-1: 3f7ab7df859cfd71af3f5c84b44f5afe9f8b77e1 SHA-256: ec389076d4b3cd8bf61a3e9f569d4798cce643b890988baccd65fbeceb4006de
194 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical detection for a malicious redirector link and a high ML score. The document also contains an instruction to disable security software, which is highly suspicious. The primary IOC is the redirector URL, which likely leads to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://ggtraff.ru/aws?utm_term=blackberry+10+android+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_5fa48bd78ba46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401697/normal_5fcb5d07bc494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416494/normal_5fac00e6b53ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449771/normal_5fec45064d6d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401545/normal_5fc6bb68d2180.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/aa64a4de-15b7-44fb-975c-024efa91b0d7/digital_imaging_specialist_jobs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f55a0b7-2e61-452e-b380-397d43b8cc9c/52534725699.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52d1814-a8b2-4561-b43a-411c8ef1512b/buffalo_wild_wings_lansing_mi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d7e00d-8715-49c8-b970-699d6d1b5621/84150213462.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/4_bit_even_parity_checker.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_off0000d56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56A 5436 bytes
SHA-256: 376e86d317ae1d6f3d976e0a1627f1b3b561a90b3a8aa4fd2f8d4bf739103ab1
font_01_sfnt_off0000e802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 11156 bytes
SHA-256: cafff2fc477f8b4510ead9b06b328858398120cb1b48b0e8dd770f4f660ba9b5

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