Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec7cf450fbd9e6a…

MALICIOUS

PDF

72.2 KB Created: 2020-12-26 17:16:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 804ae70bcbe778e8fab269292bd4a524 SHA-1: d52ea501e76f962b6f6c2e369ac45a69ee82d852 SHA-256: 4ec7cf450fbd9e6a23829bdbaf0d99b693d7312db7a2baefe707519b61b2cc6c
154 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The primary IOC is the malicious URL, which is likely used to lure victims into a phishing or malware download site. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=ksp+asteroid+space+station In PDF document text
    • https://cdn.sqhk.co/nafumozuwe/dfSjagt/fake_caller_id_app_iphone_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489852/normal_5fc59792a7284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5f9a9d013f897.pdfIn PDF document text
    • https://cdn.sqhk.co/samigimas/ghSLsgi/bofolujozewebixovawenobiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391009/normal_5fc30c8dd0a41.pdfIn PDF document text
    • https://cdn.sqhk.co/miwurazaz/gdghQjc/download_game_mountain_shooting_sniper_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/goremujoz/hbgcXii/weekend_ushering_jobs_in_abuja_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412761/normal_5fcb4a7409156.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fe3ef24aa425.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/Gjfocge/demizirebovupog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zosevid/animiz_animation_maker_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/50560320610.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/cuadro_medico_asisa_valencia_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 4792 bytes
SHA-256: 8e34976f962da7012b1eac5e6dc50a6ce3f18644a2d8a4250fead4039233c68b
font_01_sfnt_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 10396 bytes
SHA-256: e5d318f20c46fd2991a074c8706e2ab22e24bc77e11d6ba8675f850d5fd49849
font_02_sfnt_off00010613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10613 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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