Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c35aed21243b4e…

MALICIOUS

PDF

75.6 KB Created: 2021-05-27 18:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d35c299607285debfa7a762829dc49d SHA-1: a7af3a90497f6cf649c4095fb5ecfa8c38647f75 SHA-256: b1c35aed21243b4e4caa1f9ae383e8cd479c10ec019b2fb2c9b54dc77a136494
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that was flagged by a machine learning classifier and ClamAV as malicious. It contains embedded URLs that likely lead to further malicious content, masquerading as a software manual. The document body is heavily obfuscated, preventing a clear understanding of its specific payload, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cdn-cms.f-static.net/uploads/4415944/normal_601b2c4ac4658.pdf
    • https://visosoduvevup.weebly.com/uploads/1/3/4/2/134234588/ruzatabupuw.pdf
    • https://cdn-cms.f-static.net/uploads/4489853/normal_6068c73263bd9.pdf
    • https://xisasuwida.weebly.com/uploads/1/3/4/4/134472621/4588243.pdf
    • https://cdn-cms.f-static.net/uploads/4486963/normal_605c8ac410d80.pdf
    • https://static.s123-cdn-static.com/uploads/4388065/normal_5ff7d5fb1144f.pdf
    • https://cdn-cms.f-static.net/uploads/4391305/normal_5fea1f5e3f9f0.pdf
    • https://zegesunipatobas.weebly.com/uploads/1/3/1/3/131379774/wivuxonadowomod.pdf
    • https://gisafumeg.weebly.com/uploads/1/3/6/0/136098567/kusug_tozepug.pdf
    • https://xokapajutubesa.weebly.com/uploads/1/3/4/7/134730315/1140345.pdf
    • https://cdn-cms.f-static.net/uploads/4492892/normal_6016a5155d35e.pdf
    • https://buxajade.weebly.com/uploads/1/3/4/8/134880022/zisodigolurew_zelepuxig_xedotuvovove.pdf
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd2fabaa06e8.pdf
    • https://static.s123-cdn-static.com/uploads/4384459/normal_5fcd7006a0088.pdf
    • https://rurajutudap.weebly.com/uploads/1/3/1/4/131437622/8b4f7b.pdf
    • https://zukixuvaxetili.weebly.com/uploads/1/3/5/9/135988851/dokufelu_zopusilo_denisowusadalir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=rhino%203d%20manual%20pdf
    • https://uploads.strikinglycdn.com/files/8f01603d-3d52-4084-87f5-f39d223e0833/fifuvik.pdf
    • https://uploads.strikinglycdn.com/files/cc9b4836-3a60-450c-8ff9-73b22740bb62/tikunaxutefegimaxanonulet.pdf
    • https://uploads.strikinglycdn.com/files/9e6f70ac-256a-45d9-b662-0ae163a08817/86108073346.pdf
    • https://uploads.strikinglycdn.com/files/018c9da6-c399-4917-99b7-c17fcea12e71/bejeweled_3_android_apk_free_download.pdf
    • https://uploads.strikinglycdn.com/files/1dcdf9aa-2b28-42f1-8c3d-c56baceee70d/surface_area_formula_for_different_shapes.pdf
    • https://uploads.strikinglycdn.com/files/8e554c37-7d56-4e05-ae4a-56f813ccffb8/vejumutupoxuzexekoger.pdf
    • https://uploads.strikinglycdn.com/files/6deb5522-cd7d-43ae-a658-7925bb6e712f/dasosofolaposuzemorelu.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_off0000eaab.bin
e3287dd6f6615404a67f513d2f4794985b2f3292bb4a3355d6eb8592b97a0cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 5180 bytes
font_01_sfnt_off0000fc2f.bin
97ea10ecc5c4a38569dd787b70393099847fc17af9888b7fe3a937716414f409		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10904 bytes

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