Malicious PDF — malware analysis report

Static analysis result for SHA-256 31be81a96d42b2e7…

MALICIOUS

PDF

87.0 KB Created: 2020-12-24 19:11:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: df2444548f66b138ed1f1cffb80edcc8 SHA-1: d2458166e933731e7e87c00cf833dc59543ecca1 SHA-256: 31be81a96d42b2e722854f7f8a5d861e26584cba068c86d1dafecf437d34c14a
104 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of an external URI pointing to 'trafffe.ru' and the 'SE_URGENCY_LURE' heuristic suggest a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF format and the nature of the URL indicate potential for embedded JavaScript or other exploit mechanisms to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=vt+calendar+2020 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402944/normal_5fd13a6b70a3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376126/normal_5fbff0db23bcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410702/normal_5fc9beac5f198.pdfIn PDF document text
    • https://cdn.sqhk.co/gutemokerezo/2wgejaH/badminton_league_mod_apk_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5fa55bba2c928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384839/normal_5faf654cdbe8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387920/normal_5f9cdd52107ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366007/normal_5f87b48a32fcd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478131/normal_5fc7e97979fcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/soromebesowajuru.pdfIn PDF document text
    • https://s3.amazonaws.com/potamotaz/xitabemumevovox.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/kudezevavunafubix.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/widifopukiv.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/bepuvogujoz.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_off000119f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F7 4992 bytes
SHA-256: c551e41f5ada1df3475b9b93089e22f49121487e722c9291bfbfe03d0fc77955
font_01_sfnt_off00012afe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFE 10704 bytes
SHA-256: fef11147b28876fddd4a9d6f05a905a7365680510f1773b9357ff340b5bfcb13

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