Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e6b5c206c645d94…

MALICIOUS

PDF

77.0 KB Created: 2021-03-12 01:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 006b8a36b8094925ce07a08ea0699860 SHA-1: 7a92a4f62b06622c142bcc3e749084eec45e120e SHA-256: 0e6b5c206c645d948069e7da81cef1d7c6fd9c53b1b25ffc5f931041fc25d933
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, suggesting it's designed to direct users to multiple external resources. One of the primary URLs, 'https://mezovuduw.ru/aws?utm_term=hardy+boys+series+hulu', is flagged as unknown reputation and is likely malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://mezovuduw.ru/aws?utm_term=hardy+boys+series+hulu
    • https://cdn-cms.f-static.net/uploads/4408879/normal_601a9c2212540.pdf
    • https://cdn.sqhk.co/pugusomimoro/iZjnhj0/karerigeledixepulemubezeb.pdf
    • https://static.s123-cdn-static.com/uploads/4379362/normal_5fc5955e50b26.pdf
    • https://cdn.sqhk.co/mifigatira/gN9ieIZ/english_grammar_test_with_answer_key.pdf
    • https://cdn-cms.f-static.net/uploads/4369663/normal_601455776b21a.pdf
    • https://cdn-cms.f-static.net/uploads/4366961/normal_6016d5e995b76.pdf
    • https://cdn-cms.f-static.net/uploads/4421937/normal_60136423ef6d6.pdf
    • https://cdn-cms.f-static.net/uploads/4454171/normal_60394f12a07b8.pdf
    • https://cdn.sqhk.co/tilafukefuwe/5G3mjfz/man_down_song.pdf
    • https://cdn.sqhk.co/vejuwozigef/btrK7gf/gumew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc4930b5-25ad-45dd-9aff-a9fae72b91a4/12095960639.pdf
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_070adb6ecce549c5b8de904e57136c3c.pdf?index=true
    • https://1c3640e8-3530-4541-943d-4aa84fe9b526.filesusr.com/ugd/3e0cb9_e38baf302f864eea86a6493d21aa6b22.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a9bc5f7-4b85-4991-a4c9-7fe5151338c2/49936426770.pdf
    • https://uploads.strikinglycdn.com/files/c87e3c98-bec6-4f7c-81db-1395ab2d83c1/60011543511.pdf
    • https://uploads.strikinglycdn.com/files/2c3f70ab-da30-49a2-b0fb-32e4e8e16360/tiduja.pdf
    • https://uploads.strikinglycdn.com/files/16fe903c-c98c-428d-87dc-9a0462c779d1/tazisifobuxoruzo.pdf
    • https://uploads.strikinglycdn.com/files/8e3a1c8d-d82a-4296-abd9-3768b136da5b/sefavat.pdf
    • https://uploads.strikinglycdn.com/files/5e0cdc84-142a-497f-8483-90e46792ce42/nutribullet_rx_soup_recipes_broccoli.pdf
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_0fd48d51255b4d4491ca7ad07698a0e5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7c1ccebc-a24d-4fb1-bd02-f8e2a00c0ff2/windows_installer_error_code_2761.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_off0000f21b.bin
10d0fd652b0afaccc3f4058852b92576f667521a1fa31945ec02835805844c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 5116 bytes
font_01_sfnt_off00010378.bin
83c0842fd70732004dfb54a94148816adb808e376f8398d86b6d725c1fb8766e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 10504 bytes

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