Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c781fe7cededca…

MALICIOUS

PDF

158.5 KB Created: 2021-05-27 05:05:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 4d3a896b06d15a5c41b1c490f4c26f53 SHA-1: 19904b55a670ef588c2f5feae14feda8073a3758 SHA-256: 71c781fe7cededca575878c07c2f716b8f5b1fb8ee8de65f76142aaa96bc389d
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier 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 document body, though heavily obfuscated, contains text that appears to be a lure related to a movie title, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=princess+protection+program+full+movie+youtube PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495065/normal_604ae3f4ad203.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369304/normal_5feb279db9910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386092/normal_6023e6e467276.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fea007fca0ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467287/normal_5fc69adaf1a06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527357/normal_600ca7f801797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_603cf692c8ddf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5fca7536892a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454575/normal_5fe08a03bd8a7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/18faefd6-2502-47b1-9ccd-46204c1d7184/gexom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef23bf9e-cae5-4838-a993-547dcb446730/92841666703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f8738c-24f7-4941-b4ff-02bc8dc15449/fundamentals_of_electric_circuits_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcf35708-9526-4e92-a22c-c0c5b3d21180/suzuwexagejunareboboja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f4782f-77b5-4695-9db6-fde5c9b93383/how_to_make_video_files_smaller_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/412eb48d-75cf-4a7e-981a-806b61f75003/vivint_thermostat_keeps_going_offline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dfd7055-1457-4110-86ce-396af826c997/jofuzupelilerok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edb549d1-a2e4-42d1-acbe-ea01d5a9fb56/how_do_you_say_happy_birthday_in_different_languages.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B80 5640 bytes
SHA-256: cd949312ef216ef5623e8cba64ed4f82750f1b5b329c4623979363eafd6caa99
font_01_sfnt_off00023eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23EAC 13352 bytes
SHA-256: 658c92b203363c13e42b8dfdf92371f5d3b7d96806421a8a3e3923bb0ac554f3

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