Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c64a5a48e22193…

MALICIOUS

PDF

81.7 KB Created: 2021-02-13 22:21:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d6cfa5c96ca367845e7a142c030d4f6d SHA-1: 5fe39808e1e9045ba2a7b2e6176dd0b9f0b24797 SHA-256: b4c64a5a48e22193fa320f3d5b7bd5c03c892882fff1291a4218af7c07d117e6
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=sheep+cannon+unblocked PDF link annotation
    • http://farijizibeke.iblogger.org/72191002905.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/7062681.pdfIn PDF document text
    • https://cdn.sqhk.co/nopawuwam/gijbAHD/xabexubeg.pdfIn PDF document text
    • https://dolafevofi.weebly.com/uploads/1/3/5/3/135330218/1789207.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/gjhbjgx/jijodi.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/ZYjKKij/30109206405.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/wefosedutegemi.pdfIn PDF document text
    • https://cdn.sqhk.co/nukunudakiju/jjaK0Cq/66644871543.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/hbij6ii/60976100519.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rilijoxedu.rf.gd/wazuwutaboman.pdfIn PDF document text
    • http://pekufupudemolor.epizy.com/suffix_worksheets_for_grade_5.pdfIn PDF document text
    • https://s3.amazonaws.com/fonibinaraj/bilingualism_book.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_off0001048d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 5196 bytes
SHA-256: c91da8db76418a03c843c8cf2262635c6cd021ecfd0d77f366da084b070541f8
font_01_sfnt_off0001162f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162F 10520 bytes
SHA-256: eb40921ed1a24c8c357135e9f7cd2415eeddc4e9d1737a449c27a753d75417fa

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