Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc91c139b75e8b3…

MALICIOUS

PDF

76.0 KB Created: 2020-12-04 13:58:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 94ab79addd96b35b9617a885aa028ea2 SHA-1: 16876087f56e9a08ff93210d2e718905c5e7020b SHA-256: cbc91c139b75e8b32335285f52f762a2e9ee0a8af865778846f03ff26b3e5505
154 Risk Score

Malware Insights

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

The PDF contains an embedded URL that points to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download a secondary payload. No scripts were extracted, but the presence of a malicious redirector is a high-confidence indicator of compromise.

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://traffmen.ru/123?utm_term=my+soul+your+beats+piano In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378608/normal_5f961cfe7aca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f8764a453599.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489251/normal_5fc4a36269a64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369659/normal_5f8de2fd11220.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/befarekogol/mewifuvirufupenewesube.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3a89988c99b6d37b8817f/t/5fc9d7902f5dbb44b77d84e1/1607063441249/kogama_capture_the_flag_ctf.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4c3b35bcb0228a29b3dce/t/5fc7ba2c3d56556d144894d0/1606924844754/nodirodezigobugexafeboj.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/ambrish_movie_songs.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf6866a371610b876ed51/1606219405563/jerabivotosizodegim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4eda89-d8af-4f7b-8d61-2fd9f138cd1d/mujifefikepejavu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc172a2084698658e621db3/t/5fc9027daf943d21b1a1c694/1607008894971/mirofotutalugipulamaxeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06e809c1-f6c8-4e24-b616-1bfd8c4405a1/xunarovux.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/crinkleroot_s_guide_to_animal_habitats.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf54843f75b16643cc03e0/1606374532423/67140608633.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2816b0a2757459bed19f0/t/5fc761d309f4d56e8f847fe2/1606902227911/filme_furia_de_titas_3_completo_dublado.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_off0000ef99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF99 5060 bytes
SHA-256: 0d33fe1581a77d053bad4fb3f169916d0aa7ffd83ad99cc7cf0a867f5d5de3f2
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10212 bytes
SHA-256: 3e67524177b24995e5d77ffe59b4dbfa65a355e379bc8b209564f234c46741ed

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