Malicious PDF — malware analysis report

Static analysis result for SHA-256 a660376cf49b7686…

MALICIOUS

PDF

67.8 KB Created: 2020-11-17 03:43:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fbe2e40f2d4bdd9e2157caf81e12c8f4 SHA-1: 75cdebc99e72e005c2d8893506f8b9e1e3347028 SHA-256: a660376cf49b7686fdbc7d9dc6d93ef17cb38f8d94b4c1e1af0f3f28591c53c7
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The ClamAV detection name 'Pdf.Phishing.Trojan' further supports a phishing-based attack.

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://trafffe.ru/123?utm_term=are+potatoes+vegetables%25EF%25BF%25BC PDF link annotation
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/gepuxememedeto.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/megipisasupaxobu.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/dabavevozo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451025/normal_5fa1819ac03ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5f903e197b03e.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/kavitokolezub/difference_between_bsp_and_npt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd18bab0-fa90-4564-b22c-ed8b19c0077f/sagavujut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f94fc7d4-3bed-40ff-a4ec-a783fec532d5/mafodenusuzokitipodapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06b31748-40f9-4178-9505-c00ae60f58b5/10304453232.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/angular_bootstrap_datepicker_format_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2873f23d-07e8-4e2a-932c-9c20c40994bd/kitaluxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a31a84d-beeb-4ef2-bc58-a035d65100e8/muginutenuvupoj.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_off0000cc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC63 5180 bytes
SHA-256: ec2bf643aa4bf8aeabea0e012c4c81aa8b25dec86bf45141f96777c754a2df91
font_01_sfnt_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 10176 bytes
SHA-256: 415b20ab153a88262713a2057ccea598806f6bc5d7495d22ea0a88d269b48fba

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