Malicious PDF — malware analysis report

Static analysis result for SHA-256 035004b973934100…

MALICIOUS

PDF

74.0 KB Created: 2020-11-11 05:23:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a812401394e6b15f86d7e033497e6f6 SHA-1: 5248b0533218afec017fa9c684adfc279d29dd4d SHA-256: 035004b973934100508bf962f24063bdfcff09f128b06a6830fc272e744991a1
156 Risk Score

Malware Insights

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

The PDF file, disguised as a worksheet, contains a large number of embedded external links, many of which point to potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://traffine.ru/123?keyword=particle+motion+worksheet
    • https://cdn-cms.f-static.net/uploads/4460042/normal_5fa83046b3d7e.pdf
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/gimepure.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/rofulujo.pdf
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/1c1fa34.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/456bc64b-0676-4155-8563-2553509ac4bb/79155701343.pdf
    • https://uploads.strikinglycdn.com/files/f17c1eba-313f-4b76-a845-152b9d2bafa7/1878514733.pdf
    • https://uploads.strikinglycdn.com/files/0bb390c3-5686-4652-975a-b29a941bf98e/25346635562.pdf
    • https://uploads.strikinglycdn.com/files/259e8ea9-b37f-4d8b-982c-280f176d30c5/dunemola.pdf
    • https://s3.amazonaws.com/moxekibupuru/gamubakelekoranur.pdf
    • https://uploads.strikinglycdn.com/files/6c7c5965-a48c-4ba2-97a3-72d599639f31/podotogakokuwikomimexugu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d9.bin
40bbda5c9bb650b9c5915a453f4f70e6c79d1e511aa11bb6dd721bf26a1b8724		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D9 5196 bytes
font_01_sfnt_off0000f46b.bin
12a4818f87f29e98b8bed77457d4324b011aadccd64dfc7d9944fbc94fdccb7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 11404 bytes

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