Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8353be56381f0d…

MALICIOUS

PDF

75.0 KB Created: 2021-02-18 11:45:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b77c916dbcc56c43a67684243f0b9492 SHA-1: 7413256c9734ca23a31313f3daae386f2fcafbba SHA-256: dc8353be56381f0dfd735f60b912d4f54d1d4bca2f02dfa235fd9b093c4dea7b
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical alert for a malicious redirector link and a high-confidence ML classification. The embedded URL, https://crophysi.ru/strik?utm_term=the+entertainer+sheet+music+simple+version, is the primary indicator of malicious intent, likely leading to a phishing or malware download page. No scripts were extracted, but the PDF structure and malicious URL strongly suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=the+entertainer+sheet+music+simple+version In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369503/normal_5ff7c0060c8c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505102/normal_5ffc71293b65e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454678/normal_5fec22dd21b79.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/552991646d0v0h.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5feefaf5513cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449397/normal_6003a79de72fa.pdfIn PDF document text
    • http://begemot.space/1225764513z0o1z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/best_1080p_movies_site.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/nursing_clinical_evaluation_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/appointment_letter_format_doc.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/shaandaar_movie_all_video_song.pdfIn PDF document text
    • http://vazorilumi.epizy.com/conjecture_geometry_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/48265027973.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/easy_jeopardy_questions_and_answers_printable.pdfIn PDF document text
    • http://nupadamemal.epizy.com/zijom.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/butterbeer_with_tonks_answers.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_off0000e8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AF 5180 bytes
SHA-256: 25d5efa228f5d03575ae1aab97b22ced742c0758561f9e138ce4fce2fca9e7a0
font_01_sfnt_off0000fa27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 10756 bytes
SHA-256: a65c933fc3996fed87f20c37728b1ab82cfdeae7259fd936263e859a44981c42

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