Malicious PDF — malware analysis report

Static analysis result for SHA-256 85703ca5055fb838…

MALICIOUS

PDF

95.8 KB Created: 2021-04-08 19:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 517f3fef6de09f5971ff29becefec8da SHA-1: 56ec30c25731df3ed5c7cecc44e5f3f845a0d1c7 SHA-256: 85703ca5055fb8382e8292b411515ddf63583e97e8072b6a6ac1c3ca830a1332
136 Risk Score

Malware Insights

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

The file is a PDF that was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of external URIs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggest the document is designed to trick the user into downloading a password-protected archive, which likely contains a malicious payload. The embedded URLs, such as 'https://jacksth.ru/strik?utm_term=biblia+critica+textual+pdf', are indicative of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jacksth.ru/strik?utm_term=biblia+critica+textual+pdf
    • https://warubeduzubam.weebly.com/uploads/1/3/5/2/135298611/c620f.pdf
    • https://kunolutupevuj.weebly.com/uploads/1/3/4/7/134772201/1cf75b37bcec6.pdf
    • https://static.s123-cdn-static.com/uploads/4389794/normal_5fd091082f8a0.pdf
    • http://rezanufeku.mygamesonline.org/85677965205.pdf
    • https://cdn-cms.f-static.net/uploads/4500893/normal_5fd310a13936a.pdf
    • https://static.s123-cdn-static.com/uploads/4456377/normal_5fdd14d00a9d1.pdf
    • https://static.s123-cdn-static.com/uploads/4370064/normal_6003980641e5c.pdf
    • https://cdn-cms.f-static.net/uploads/4472495/normal_603f544b318e0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://85377554-d84f-42a6-a955-c87f7d5d3d8c.filesusr.com/ugd/dd4472_ee9ae54243184a0ca59a57662d0d0a3a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fce0dfa3-1825-4ea3-a936-10be5188aed7/what_are_the_stocks_in_dow.pdf
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_a051275fa079402fb6dacab603bbaa9d.pdf?index=true
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_818e78529527433cae4aea49e64617fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d55db124-8a81-48b0-a972-bcb0dceaf5d5/frigidaire_mini_fridge_with_freezer_black.pdf
    • http://legokejapo.atwebpages.com/sopufuk.pdf
    • https://uploads.strikinglycdn.com/files/76e1b576-8b20-43a8-a717-5bcdb6137052/15096323122.pdf
    • https://uploads.strikinglycdn.com/files/faea94d3-5821-45c3-bf73-ee47cac5c93f/vebekejoxuzufisab.pdf
    • http://senawoxagijajo.onlinewebshop.net/fivaxut.pdf
    • https://uploads.strikinglycdn.com/files/194c1741-8120-45ad-aa68-2f399f4a3ca7/star_trek_enterprise_episodes.pdf
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_b9c4ea34885b40d4863421d94096c217.pdf?index=true
    • 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_off00013597.bin
78f2faeba6181e0acd0eb477cfbecb3b6ab8c215cfe64feb429ce6794fcb2a07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13597 5228 bytes
font_01_sfnt_off00014771.bin
e4963c1a87bb481a13bc5591f544184bc072e2c69f73c2033c6df33add1d3b19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14771 12928 bytes

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