Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb4dee98621c3d5b…

MALICIOUS

PDF

73.0 KB Created: 2021-05-30 06:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 9f42bc29dfd38ae6a401f758ed711561 SHA-1: 6418f2a3f02a47bb01808039d5e31ccc58f38c65 SHA-256: cb4dee98621c3d5b87de1c4d9bbb7231ec51aea729785b568f50f7fc22105d6a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various platforms, suggesting a link farm or a method for distributing further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://cdn-cms.f-static.net/uploads/4494681/normal_6022f66c1f400.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383322/normal_6013c5e9ed585.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_5fd7c0e50673e.pdfIn PDF document text
    • https://joxujodeli.weebly.com/uploads/1/3/5/4/135400218/2982603.pdfIn PDF document text
    • https://toxilitabosi.weebly.com/uploads/1/3/4/4/134495834/voxugufim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_600a4f5a92a34.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/guposidesawovej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450630/normal_5fe6e8b56680f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460982/normal_5fff4a412e1cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6039248eb9b35.pdfIn PDF document text
    • https://vibakifekapob.weebly.com/uploads/1/3/1/3/131398015/bukekopotog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_6005dffa6ad48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420020/normal_5fe5596f3adb9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=how%20do%20you%20know%20when%20to%20enter%20a%20trade%20in%20forexPDF link annotation
    • https://uploads.strikinglycdn.com/files/bde4d65c-6c08-4160-a51a-41e0f23b0e18/www.funcionjudicial-guayas.gob.ec_consulta_de_pensiones_alimenticias.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a143c53a-dd71-48c3-90b8-98e645ebf032/a_raisin_in_the_sun_play_actors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55bb312-c269-4674-9fd9-a5ad4c968b3c/bibufokejadumiger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38fe0f28-ea23-4d57-a74f-9542a7793aa7/72463602096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2eb4ac6-0d30-4c38-9cec-02261722d06c/25851619294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/add2232c-0f43-4b60-8714-f4fca33c50db/wewipiwirefakodefofoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc665bab-ad55-42e9-b33e-2e4b167b8348/how_to_check_driving_licence_status_online_in_gujarat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083d62ae-91f5-445a-b9c7-19336c5c8631/nidekofeseluvupimosiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2588807-70f8-4ad5-9020-9b2517311b44/sejera.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_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 5072 bytes
SHA-256: 4715704d7410b12ee4c1d9e4c6bc33f8d257f525b6d4407e935d54ef7de48577
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 10812 bytes
SHA-256: 3cd8936083e0a57ed9389f97da4209ee81546cbaa64e14a688b76f061fd423ec