Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c4053c904a1412…

MALICIOUS

PDF

68.0 KB Created: 2020-11-18 02:54:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 077a6f31fc8e515b29e0a746c8ae6694 SHA-1: d1f7a75507996f34709983f918631c803bdce513 SHA-256: 55c4053c904a1412b9157193bd40337338f4080caa957dcae573056e56d78e68
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, suggests a lure related to a 'Clarinet fingering chart'. The presence of an external URI strongly indicates an attempt to redirect the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/123?utm_term=clarinet+fingering+chart
    • https://cdn-cms.f-static.net/uploads/4469852/normal_5fb39aa1ad6dd.pdf
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f8f0058da327.pdf
    • https://cdn-cms.f-static.net/uploads/4501367/normal_5fadf2479069f.pdf
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fa5f51b040ec.pdf
    • https://cdn-cms.f-static.net/uploads/4480899/normal_5fb45d6614292.pdf
    • https://cdn-cms.f-static.net/uploads/4416512/normal_5fa152242fd5b.pdf
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5fa99fecb3275.pdf
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5fa86a3f6918b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sukobogixe/jatapetugasejaxaped.pdf
    • https://uploads.strikinglycdn.com/files/e2c3b27b-8d9d-4187-920f-1d4330d5c521/73589973181.pdf
    • https://uploads.strikinglycdn.com/files/9b5d1c2b-e0b0-4edd-9eea-4724e6907ecc/scholastic_level_exam_practice_questions.pdf
    • https://s3.amazonaws.com/sikuva/46149872803.pdf
    • https://s3.amazonaws.com/ronatiduzoxij/autocad_2010_32_bit_filehippo.pdf
    • https://s3.amazonaws.com/tekujel/69909525931.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfee.bin
d7c42c976bcb70d424533229d96405701f9fa66c3df373137cada81c45a1d501		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFEE 4872 bytes
font_01_sfnt_off0000e07d.bin
b3a7836260604a6230350ac4f9f61afb1f2cd4e28601972475683050098dfb5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE07D 10304 bytes

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