Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fe3ebd44281db27…

MALICIOUS

PDF

63.2 KB Created: 2020-11-24 08:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c41a7ec4433340cdb18c4573d2c9c2a0 SHA-1: b1c588190de7a9f287642c5269629955d9dd2610 SHA-256: 8fe3ebd44281db27da002d90d8a9f793cc66c1d8c3de4f370c04e71a05f53151
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text fragments that suggest a lure related to a 'Dynaco st 70 manual'. No scripts were extracted, but the presence of external URIs and the malicious verdict strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=dynaco+st+70+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369322/normal_5fb74308dd054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f8f6629b8b6c.pdfIn PDF document text
    • https://jadixuzipekufa.weebly.com/uploads/1/3/4/5/134594590/974960.pdfIn PDF document text
    • https://fupojipivub.weebly.com/uploads/1/3/4/5/134525069/netuwakijumore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365608/normal_5f881f047a5f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368954/normal_5f970e52d77fe.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/a91635de-13ef-40d9-bf9a-eeafa2cc1088/jafunoxobarakapulat.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/nuzitukuzanofa.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/major_world_events_in_1994.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_off0000b968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB968 5172 bytes
SHA-256: f4e1b8221774f4532a55e9f325f563d6b576add8caa079119ed9fd5dacf7a687
font_01_sfnt_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 11176 bytes
SHA-256: 3955fecd02fb1948f2678e96e151394fa99440f5678e77e237bcfa8536e72c12

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