Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9aebde370153e8…

MALICIOUS

PDF

76.0 KB Created: 2021-05-22 02:24:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 23ec70fd24a491e1770db839f0ff1a38 SHA-1: 2fedb11ca17a117eb214046257b373755fd7fa5c SHA-256: 7c9aebde370153e80d5e532329acd6fb306da0015e4210b568f7c67994f2ed71
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to redirect the user to a malicious site, likely for further exploitation.

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=como+colocar+moldura+de+gesso+na+parede In PDF document text
    • https://static.s123-cdn-static.com/uploads/4380531/normal_5fdfefe8b2ced.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_604d7edb2df91.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff55bfebe400.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/bisiku/what_is_ariels_dads_name_in_the_little_mermaid.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/figurative_language_tell_tale_heart_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/909c3ea6-0d03-498d-bdca-d1907500548b/what_does_van_mean_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/guvele.pdfIn PDF document text
    • https://s3.amazonaws.com/bisapovepizaj/72418692128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4243f592-032d-472c-93a8-0a2f8cf6999d/xerafiwezumigajebolukapuk.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/bluebeam_revu_stamps.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea85a3a-95ea-427c-9f38-c1a62f9d8c9e/7196621291.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/8921371265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7555b4f0-1934-4452-9dcf-89c937f91b8c/master_airbrush_e91_assembly.pdfIn PDF document text
    • https://s3.amazonaws.com/kotenu/prevent_outgoing_calls_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/zovojos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20532ebc-2435-4a86-8136-4985d2665c4f/ilive_bluetooth_soundbar.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/sabiloxuruvotejeteda.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/91443296772.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_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 5300 bytes
SHA-256: ff9145229e7e0563cea38846b7667f91fa97185489c03a6f838c223b1bac33bd
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 13172 bytes
SHA-256: e14e49bf51aceeae6b83a25da68e0beff60a5916befc9349656df0274a2279a9

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