Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef951d05eec38e1…

MALICIOUS

PDF

70.6 KB Created: 2020-11-17 04:13:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b1e9ee7e11c18dcaf0b454fe52827f8e SHA-1: d15a1f0e01464659b86ed8a25cc7cc57edf1a534 SHA-256: 4ef951d05eec38e1ea6cd024d569b26ac8f79c54b93e64c6c8869e73506ba4af
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffking.ru/strik?utm_term=pes+2007+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f872546637d8.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/4486777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366622/normal_5f875a06d6571.pdfIn PDF document text
    • https://gozaxuvo.weebly.com/uploads/1/3/4/6/134612917/fab7ec0253.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://uploads.strikinglycdn.com/files/b5ed9245-f863-4089-9fee-53f1b5f0e1bd/86757376697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa95d0aa-54a0-4719-9b9b-a54321445a2b/97900908340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c11246ac-4b44-4047-8fa4-258ab4b30554/64974179068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5315670f-194c-476b-bae8-5127f05f5e05/building_vocabulary_skills_chapter_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed93b14a-39fc-4294-9c74-c26fed8c9be1/49592201081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedbf72b-265b-4ab2-a8b7-b25235cea69e/witefowiwemizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734ebf80-007e-45cf-bd86-b063a8389d43/sram_guide_recall.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_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 4548 bytes
SHA-256: fc4a7909cd6df9ace3e8cdd64b2fbf1ea07b762aeec00265279c8f39c601d9e0
font_01_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10740 bytes
SHA-256: a25225fe4ebcb0ac8cbcaf825bdf6ba25787868a9b0d585d60bb543eedc7e9e6
font_02_sfnt_off00010024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10024 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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