Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d4b6689ba6098e…

MALICIOUS

PDF

74.4 KB Created: 2021-02-26 19:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2e209a0c9e3a628f53a3ea6e8312c30c SHA-1: bbaf6f8408b363467ff9b76a606e71c3ab665a7e SHA-256: b6d4b6689ba6098ead9b975c9255486621b5b6b84c16fdea6fb7d26466c7a834
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL. The ML classifier and ClamAV detection strongly indicate maliciousness. The document body, though heavily obfuscated, appears to be a lure related to an audiobook, directing the user to a suspicious URL. This suggests a phishing or malware distribution attempt.

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
  • 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/wb?keyword=jocko%20willink%20extreme%20ownership%20audiobook%20free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5fee7de97feb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_602f453073236.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/fhaKGif/gegofipitodor.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369783/normal_5ff9fa5431b2e.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/fwoil2F/td_auto_centre_kitchener.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488581/normal_6031f08cf414e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_601259cd63541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420764/normal_6031cc2c189c1.pdfIn PDF document text
    • https://cdn.sqhk.co/xoberuweri/jxghiJp/yasuhati_with_your_voice_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462708/normal_603145ec51d14.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/tiluwisulepam/brother_sq9185_bobbin_cover.pdfIn PDF document text
    • http://gotenekopibijo.epizy.com/nier_city_ruins_piano_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/gudenupejizuxad.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_off0000e5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BF 5748 bytes
SHA-256: a12bbff3a012a656abe4e6e37cfeed691361868c8d0674f8caac4866cbe45876
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10300 bytes
SHA-256: e2d7f50c36081606912d60ca6a2775328a111ef6ab559d8951c2322b0267b87e