Malicious PDF — malware analysis report

Static analysis result for SHA-256 79df2832a59425a3…

MALICIOUS

PDF

90.3 KB Created: 2020-12-25 05:36:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ddecf653801b0a40ac5f7bde48a7f25a SHA-1: 96f2e2be7e9ee122031e281096d065fc8a1f2620 SHA-256: 79df2832a59425a3184f43d67e0ed0619686532e8790e61cb8e2a06fb5320709
96 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to 'https://trafftec.ru/123?utm_term=ae+housman+poem', which is likely a phishing lure. The PDF structure itself appears to be intentionally malformed, with duplicate object bodies, suggesting an attempt to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=ae+housman+poem PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483349/normal_5fcc09637e8d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5f91c4078a056.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_5fb8a86d6a93f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8756d741728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5fc32f91e22cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378406/normal_5fc529943e7c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416811/normal_5fd223b18a1af.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384819/normal_5fddbf761f450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5fdfb5d3bde4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_5f95706eb06a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fc945c6a71da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452152/normal_5fd7eec449af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365649/normal_5f88515cbc28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5fd21c26df6b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381297/normal_5fcc9efac87d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389355/normal_5fd79663e1598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421466/normal_5fb59a98d6e09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 4920 bytes
SHA-256: 85b8dbfbc2a4af8cfe0ef6dc905ad30fc0cf65122f38c345934ca5899be3f890
font_01_sfnt_off00013599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13599 11808 bytes
SHA-256: 4adfe8e475b718472bcf9263a5a775612a4889b44746c87340fe6db0affdf405

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