Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b20caeca0245be…

MALICIOUS

PDF

75.1 KB Created: 2020-12-24 13:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 97eb517be19c0dd0c954aad8f5584438 SHA-1: 840bfce47b96bfaf3e32d64b47a73f8d399d9032 SHA-256: 77b20caeca0245be089b657b36676183f1aa04f93388d702fce68de52204219c
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains an embedded URI pointing to 'https://trafffi.ru/aws?utm_term=free+random+video+chat+app', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a 'free random video chat app'. No scripts were extracted, but the presence of external URIs and the ML/ClamAV detections strongly indicate a phishing or malicious content delivery attempt.

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://trafffi.ru/aws?utm_term=free+random+video+chat+app PDF link annotation
    • https://cdn.sqhk.co/dijobika/Ahjidjg/pamulujuwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_5f89d2116eef7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423428/normal_5fbd6378899cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373797/normal_5fac50d832064.pdfIn PDF document text
    • https://cdn.sqhk.co/dosijowikul/igEjiie/21100280482.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://uploads.strikinglycdn.com/files/06e18688-d32a-4072-89bc-bb5baf0be951/un_viaggio_attraverso_incantesimi_libri.cx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a41f9a-455d-4774-b0f5-618c0577ce02/graphing_quadratic_functions_in_vertex_form_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecc0020d-0390-4770-800b-ad0241b461bd/94836831048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6b942b-5ea2-456e-aa8d-45626c837d64/kubovaxijak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/154a2de8-ea1f-4ffe-8c7a-c2f5e757fe94/68045763865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2a8c1a8-5fd5-426d-a9af-4467b90a7e40/sakemezaligoson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c72509ad-fa6c-4e23-a57a-e0eb264c8e28/35023786834.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99ea3a28-9a73-4444-8e80-ab75e1f1e82b/masterbuilt_pro_dual_fuel_smoker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d0f4d19-7215-40d3-a1b4-a0f4fbe833a6/half_hanged_mary_poem_answers.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_off0000dae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE6 4908 bytes
SHA-256: decf9ce54d47775df5170a13c2cbc8e79e185af1ec1a731652bfe3ffd5454a60
font_01_sfnt_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 11488 bytes
SHA-256: a880c2770bcfb18b9da5b4717c3eed044f240664feaed8408a61870ab380e523
font_02_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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