Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf16cb7b0ccbf2b…

MALICIOUS

PDF

72.0 KB Created: 2020-12-07 06:49:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 0965749b09ddb37419c1f797eba2c931 SHA-1: 5dd97f166b6225d20c8eb01055bfcbae2e244ea8 SHA-256: dbf16cb7b0ccbf2b1219d20584c228c844b277b8d5b9f9966d5f3d1bf51aaab7
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains an embedded URI pointing to a suspicious domain, likely intended to host a phishing or malware delivery page. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aligning with a phishing attack pattern.

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://traffset.ru/aws?utm_term=heteronyms+worksheets+for+grade+6 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393901/normal_5fb9c690c15eb.pdfIn PDF document text
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/6b00caa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469834/normal_5fa52135c5fd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425768/normal_5fc3144d75d91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379841/normal_5f8b16a93c019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f8831b5526e7.pdfIn PDF document text
    • https://lerojapozexux.weebly.com/uploads/1/3/4/0/134016693/2415919.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f989fb89fba8.pdfIn PDF document text
    • https://xowuxuwakewobi.weebly.com/uploads/1/3/4/8/134853014/lajalo.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://s3.amazonaws.com/kukazowox/75071363696.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b77ea53-9542-4c9c-bcc4-c8deae13c50d/67266529717.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc78550418d7934ac777b2c/t/5fcd8cb3eb18547f4b9d67ed/1607306421015/wodelewujapodejilurubar.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/74678231642.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_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 5400 bytes
SHA-256: 6df00e1eaa11e43e29dd788f8f0a6355bfd4871f632aeb611d313ce35905472a
font_01_sfnt_off0000e015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE015 10952 bytes
SHA-256: 7ec71b4a1bc7b33c8ff008414c3eb6cf0a847bf1ba7ffca4684106fde4a21cfe
font_02_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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