PDF malware analysis — malicious · 9f8833d979782a0d

MALICIOUS

PDF

75.2 KB Created: 2021-07-13 19:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)

MD5: 02598ea64ac5a2820abfe00e09a4522f SHA-1: 8df47a76958d21d0c34df7bfa1b080d9c874fc27 SHA-256: 9f8833d979782a0d917b597e57bc077f3014b87bd9842e301f338ad77e9c6aad

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The 'SE_URGENCY_LURE' heuristic suggests the document attempts to create a false sense of urgency to prompt user action. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.7483

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
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://feedproxy.google.com/~r/razvivatel/yapz/~3/4Ji06Fp1PxY/square?utm_term=definition+of+hiv+aids+pdf PDF link annotation
- https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60ec9d58def1ca41d5fb962e/1626119512974/judicial_interview_questions_and_answers.pdfIn PDF document text
- https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60e93a2ce51f1f218d6acfc7/1625897516122/write_the_chemical_equation_for_cellular_respiration.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60edad64151a035e9e7d5bf1/1626189156831/product_design_at_regal_marine_case_study_answers.pdfIn PDF document text
- https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60e94b0892abcc18c4f76309/1625901832558/great_companies_to_work_for.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c9f6.bin` `dccd17a56a0b0dd572343be1c9599aa74cdfbacc920e6cdfc0966769b3f6f79b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC9F6	15336 bytes
`font_01_sfnt_off0000f123.bin` `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF123	16792 bytes
`font_02_sfnt_off0001093a.bin` `0e8c5a44c07c86642bb44d73f960d3a12f70add080af36cfba4b190c58456ce2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1093A	10516 bytes

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