Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03af824d2beafe5…

MALICIOUS

PDF

94.6 KB Created: 2020-11-25 15:14:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b71be095b2c7e9fc1587229679fa853 SHA-1: d17c6fe2e4999e68ecc4a0d1ce413ee56e7d069e SHA-256: f03af824d2beafe59c8be6d1bb2d0dfb7a82640e596c3e2c70c7754647042f87
96 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains an external URI pointing to a suspicious domain. The document body, though heavily obfuscated, suggests a lure related to an 'ecological model PDF'. The presence of embedded URLs and the overall detection indicate a phishing attempt, likely delivered as an attachment.

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://trafffe.ru/aws?utm_term=ecological+model+bronfenbrenner+pdf
    • https://cdn-cms.f-static.net/uploads/4420610/normal_5f98df669c30f.pdf
    • https://cdn-cms.f-static.net/uploads/4446152/normal_5fbae7bba18c1.pdf
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f9bdccea83b5.pdf
    • https://cdn-cms.f-static.net/uploads/4369185/normal_5f89e552ad21a.pdf
    • https://cdn-cms.f-static.net/uploads/4455180/normal_5fb2daadaba78.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/224cfc58-090a-4d04-93df-d92d0f329af4/80198311016.pdf
    • https://s3.amazonaws.com/newopetusam/nenepu.pdf
    • https://s3.amazonaws.com/bakoloj/weseguxawezi.pdf
    • https://s3.amazonaws.com/felasorarabipis/bobbin_lace_patterns.pdf
    • https://uploads.strikinglycdn.com/files/1bc93dff-54ef-4ab0-b2b7-595dc8234fef/949-732-6161__-5944.pdf
    • https://s3.amazonaws.com/fulomufimikim/chicago_metallic_bakeware_brownie.pdf
    • https://uploads.strikinglycdn.com/files/e1e67b66-ca38-4c81-98f4-5c7ead45f08e/61357086655.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_off00013557.bin
df376ad0a58ffcfc7759e9033722bd02cb07d5b3f458c110101c54022a7a3aec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13557 5396 bytes
font_01_sfnt_off00014797.bin
bb6c9801553584aa8c88d59f4e9a89c8480dea00b6dbc6f05c80eed295781f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14797 11076 bytes

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