Malicious PDF — malware analysis report

Static analysis result for SHA-256 5efa86a1247d7d0b…

MALICIOUS

PDF

69.0 KB Created: 2020-12-22 11:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3d76f71e29a5e68b2720bb692a212010 SHA-1: e0adc956775e715692ba2c8ec70931b006c43784 SHA-256: 5efa86a1247d7d0becc3c5ced5d30c649e29d7b506cafd3dad3f656074219976
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent URL pointing to 'traffine.ru', suggesting an attempt to redirect users to a malicious site. The PDF's content, though partially corrupted, includes a phrase related to 'Infection in blood and urine', likely a lure to entice clicks on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/strik?utm_term=infection+in+blood+and+urine PDF link annotation
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/tizitosuxa.pdfIn PDF document text
    • https://lidafuxabu.weebly.com/uploads/1/3/4/8/134891514/fee851780a8156b.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/a623ffc5-3d7a-459d-84c6-a5cd40bd0518/21330309047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28729d56-40cf-4726-80b0-00090914f6d6/83910270049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bf236f-cfb6-411b-b667-6fc4d870c9a7/50484551734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af08f16e-ed73-4272-a13c-64a91011ac91/nutrichef_air_fryer_pkairfr54.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4da7b403-7cac-4859-bd2f-48664a22c8e2/diagram_macam_macam_variabel_penelitian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f537937-9587-4e9a-a2fe-1be208429a3f/ccta_ny_provider.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5ae466-bd7d-4230-ace3-196cc34e0d75/worksheet_brain_functions_cerebral_hemispheres.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/gesapufawosewetujanexanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ec8c6e0-b4e8-4994-8a9d-d7550feb6e68/zenemipilamoxulugunofijil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eef2d0b-332e-4718-969c-5ae0f764e869/bepezidobefofiju.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/exploded_view_inventor.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/59249799562.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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 4912 bytes
SHA-256: 44564049fa8789a37b6057c74a8afe41642260f83d6857e607646e1b9025d66f
font_01_sfnt_off0000e64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64C 9796 bytes
SHA-256: 702fb74ea05bece3466ccab5aaa35608e485a60e3af6ac043df01fe6a557f945

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