Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b8bb4530833125…

MALICIOUS

PDF

68.5 KB Created: 2020-11-14 22:42:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1272655c9444d555eed9efa3d53f36ad SHA-1: 5c3c01b2b7068e2a092b1f4ff4799eec181c4cd6 SHA-256: 56b8bb4530833125587f1130f7c28f0c0e8b0befae9b6b2fb2571b5c989e42f3
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by a machine learning classifier and ClamAV. It contains an embedded URI pointing to 'https://trafftec.ru/123?utm_term=the+break-even+point+calculation+is+affected+by%253A', suggesting a phishing or redirection attempt. The document body is heavily obfuscated, but the presence of the external URI is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=the+break-even+point+calculation+is+affected+by%253A
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5fa22367ef4b2.pdf
    • https://cdn-cms.f-static.net/uploads/4366004/normal_5f87eb92decab.pdf
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/d1449ea771a4d66.pdf
    • https://zunivagakasati.weebly.com/uploads/1/3/4/3/134340202/nakowidu_sajaforuxak_bezanut.pdf
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5f9ff01d169a6.pdf
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f8da7a46539c.pdf
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f915c5daf435.pdf
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fa20289dddaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/54fabe6b-d71f-4d69-89b9-958144a7c322/spanish_language_learning_books_free.pdf
    • https://uploads.strikinglycdn.com/files/71d6eafe-074f-4742-a0ce-4e0a5d853215/74367586065.pdf
    • https://uploads.strikinglycdn.com/files/45133d04-e521-428f-a4fc-505d6e6c9036/mulatunajilemasa.pdf
    • https://uploads.strikinglycdn.com/files/e2c761ff-73dc-4d0f-8574-f7297be0b662/99006354725.pdf
    • https://uploads.strikinglycdn.com/files/9f3532af-da1c-4655-8c1d-cc7d4fb89466/tegepaji.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_off0000ccb8.bin
06d5377cc53eec0dded34347a94c300fb6c2ad10bbd4591ca4e556aa50e36a59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB8 5640 bytes
font_01_sfnt_off0000dfe9.bin
d75f0539559925c17e14389566d5e59a0e291f7ea3e670ac6b4b72abb960e3e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE9 10720 bytes

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