Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f634449e68ef97…

MALICIOUS

PDF

66.6 KB Created: 2020-11-16 15:40:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a99e4bf2a15d276fbfaaac8dd6658a4f SHA-1: 0d2bdbe37daa8567eebdf5efe2af08416c3e821d SHA-256: a4f634449e68ef97ebfe5d3e7dbde6f9ef3817e8d5f19b09f510d0eaf5f85e60
104 Risk Score

Malware Insights

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

The PDF file was detected as malicious by a ClamAV signature (Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0) and an ML classifier. It contains an embedded URI pointing to 'https://trafffe.ru/strik?utm_term=british+gas+timer+model+up2+manual', which is likely a phishing lure. The document body, though heavily obfuscated, contains text related to a 'British gas timer model up2 manual', reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=british+gas+timer+model+up2+manual PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/robipubifesu.pdfIn PDF document text
    • https://s3.amazonaws.com/fasotajedag/metabolic_factor_diet_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d97aa8e-1805-4b82-a226-91a6ce5b4d3d/11219590028.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/keto_diet_cookbook_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af8c2c55-2acf-44e3-90cb-a6c5879900e0/google_calendar_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/960d5fa7-a97a-4f84-ab57-aa7926ea639d/soleranifuriroxej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbc7b8f-4c24-4eac-8621-cf5a904781e9/tarjetero_calculo_mental_primaria_si.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/61194768406.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15120d3c-287c-4775-ac42-3b20cd08dea5/zatutugujemokukutofin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad0a1d2-9d7d-4761-9bac-33811c5e0fd9/kunuxesurawomo.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/23549939057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7faa358d-dcf0-43c0-8afc-88b6c8757e94/jitesosebaduziduw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52223a51-b604-44b4-b430-16b5586a7ed8/33715147908.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_off0000c7cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CB 5556 bytes
SHA-256: c9617744b6ff38a380eeeb2ec8a67a67122c20f4a9cfe956359bcf65fddce7ab
font_01_sfnt_off0000da86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA86 10392 bytes
SHA-256: 37080183e0284028884ce9d083f5613219f42763779b85098b0a8d7822a15192

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