Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f9880d8499a001…

MALICIOUS

PDF

68.9 KB Created: 2020-12-16 14:13:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8cd55e1d3a3c298acbaa4ba250a2c683 SHA-1: e8563ce6a2cc6e6f46e47af145a3c2d196fe5e96 SHA-256: c5f9880d8499a001c1a7ed9454a2117bcd4fa418c48e15cb296d8c2fb7d8981c
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URL that points to a suspicious domain, trafftec.ru. Machine learning classifiers and ClamAV both flagged this PDF as malicious, with ClamAV specifically identifying it as a phishing trojan. The document body appears to be malformed or obfuscated, but the presence of the external URI and the high confidence threat detections strongly suggest a malicious intent, likely to redirect the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafftec.ru/123?utm_term=the+world+on+the+turtle%2527s+back+questions
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f8ded9851cb7.pdf
    • https://cdn-cms.f-static.net/uploads/4413842/normal_5fa2b65e73eb1.pdf
    • https://static.s123-cdn-static.com/uploads/4458616/normal_5fd04f29890b0.pdf
    • https://cdn-cms.f-static.net/uploads/4382780/normal_5fc2a28997c2f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc7991fd32fb7060d12c8d1/t/5fccad78c836a917f908ceaf/1607249273486/hearthstone_meta_stats_mage.pdf
    • https://s3.amazonaws.com/kudefem/madonna_of_the_long_neck_by_parmigianino.pdf
    • https://uploads.strikinglycdn.com/files/fecf504f-13a1-4a31-9993-061facf25024/book_of_soyga_amazon.pdf
    • https://s3.amazonaws.com/tejuvonixag/t_shirt_design_size_template.pdf
    • https://uploads.strikinglycdn.com/files/50079b4f-ba38-4df9-8253-02e1c8b81ba3/38804293237.pdf
    • https://uploads.strikinglycdn.com/files/7e91bbb9-4f47-4b2f-92aa-e574ff444caf/commander_of_argus_guide.pdf
    • https://s3.amazonaws.com/gotitibekovi/kivexezumuwugogizefisigik.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_off0000cd9a.bin
f6586c00feb0ff1df963624fc2161c9c18a85a2653b2ff0bf39edff144e6ae2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9A 5432 bytes
font_01_sfnt_off0000e01e.bin
c7f832a5c4ae248968c3512f2b87d35a62c681b789b31006ec05c3738d0c0283		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 11520 bytes

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