Malicious PDF — malware analysis report

Static analysis result for SHA-256 872c8d3d78c7b976…

MALICIOUS

PDF

61.5 KB Created: 2020-12-20 08:36:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e62dff964c0af3e5e09f9d51c59401f0 SHA-1: 93e34a41f554f934b08c020fd6c5e99e629a7726 SHA-256: 872c8d3d78c7b976905e05d6fce2d4bd4a0f89c0cf50600bf4f2c6ed866d7d7f
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to 'https://trafficel.ru/strik?utm_term=stained+glass+lighthouse+patterns', which is likely used for phishing or to download a secondary payload. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links and the malicious verdict strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=stained+glass+lighthouse+patterns PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383131/normal_5f8ebee76c760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384316/normal_5fc7463fb4bdf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_5fb7ec4ce776e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_5f9726105b7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_5fd1e043e9ff8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_5faf6ec3b6308.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/911bdde2-830a-4aca-926a-a63285a8b2e3/vusokuvaviwowisalubopu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce28aef169c371838629d4/t/5fd75dc9267c8d0ace650e72/1607949769453/multiplying_decimals_worksheet_6th_grade.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59f20ff13940aa25faf9a/t/5fd1887efec2791e31ffae06/1607567486371/45377779483.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdc7d42ec98190d8a5337c0/t/5fdc957c17e3a13a98324242/1608291708573/rojidurefamizabudim.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/43778762391.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/10068019786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e845f3-8752-417a-add5-fa89e7bfb0f0/words_with_the_same_beginning_letter.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/mifulobagefivizaw.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f252e5c7695ca99bde90/t/5fc534e8a97599144ea21479/1606759658362/no_manches_frida_pelicula_completa.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_off0000b3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3A5 5324 bytes
SHA-256: 2229a879abee5fbc8c6f9ac1d664cc032cefb12d6404999a8e6eafe3162ef00b
font_01_sfnt_off0000c5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B4 9936 bytes
SHA-256: 330a5ae4014a5c1e47d8fc3172d200160e42104b55b65e2c65612e832346ac5f

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