Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6c852cfeb8d6e35…

MALICIOUS

PDF

65.8 KB Created: 2020-12-18 09:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5de7165932b8ef5993d46cda286ac1e SHA-1: 56f797775825cc496b671f909a9ae310c4c06aba SHA-256: a6c852cfeb8d6e356d68959978b157830d730cc3da5ea9eac83a3eddcf761f28
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for phishing purposes. The PDF structure itself also shows signs of manipulation, with duplicate object bodies.

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://trafficel.ru/123?utm_term=texture+in+art+for+elementary
    • https://cdn-cms.f-static.net/uploads/4384482/normal_5f8ff1567b522.pdf
    • https://cdn-cms.f-static.net/uploads/4451028/normal_5fc1feac7bc74.pdf
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5f8829f01a992.pdf
    • https://cdn-cms.f-static.net/uploads/4367656/normal_5f97053ed3596.pdf
    • https://cdn-cms.f-static.net/uploads/4491723/normal_5fc10a4c15148.pdf
    • https://cdn-cms.f-static.net/uploads/4448540/normal_5f9f55661404a.pdf
    • https://cdn-cms.f-static.net/uploads/4474462/normal_5fa9e7adc5c1e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d2da4ce-58a8-465c-aee4-13688f9ff775/sound_of_music_review_worksheet.pdf
    • https://s3.amazonaws.com/gasodamuza/satonefanukobovoguw.pdf
    • https://uploads.strikinglycdn.com/files/3c558f94-64c7-412f-9255-ce502499060f/vojagosore.pdf
    • https://s3.amazonaws.com/lolijexejomak/zilun.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_off0000c6a6.bin
bbf9149add2d8a1eadb10cad6a4ab480260fdd6419cf25e065df083321928d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 4852 bytes
font_01_sfnt_off0000d721.bin
9257b8b432c45529e0be5811d2ff56c1d662875b041b65c7c5cea5db3d4c3fba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 10512 bytes

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