Malicious PDF — malware analysis report

Static analysis result for SHA-256 e931c741115519bc…

MALICIOUS

PDF

69.5 KB Created: 2020-12-20 17:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 589cc268fb19c9d637d6c1602a1c6e24 SHA-1: 9bc2c58a213eedef6919798ac6d169eede6e9393 SHA-256: e931c741115519bccabaedb9b783661568c6bef62c1c1ece0d1b2f19a1be62e4
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or SEO spam campaign. It contains numerous external links, including one pointing to "https://trafffi.ru/123?utm_term=cartesian+coordinate+system+worksheet+pdf", likely intended to redirect users to a malicious site. The malformed stream length and the presence of a link farm suggest an attempt to manipulate search engine results or deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://trafffi.ru/123?utm_term=cartesian+coordinate+system+worksheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445544/normal_5fd677123fb39.pdfIn PDF document text
    • https://jufoxaju.weebly.com/uploads/1/3/4/4/134489692/9992709.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_5f90f8da242b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_5f9248521548d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fb60107decee.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/mifusogagene.pdfIn PDF document text
    • https://mabudorowux.weebly.com/uploads/1/3/4/4/134458492/goxebos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_5f8ea84fe6ef9.pdfIn PDF document text
    • https://toraboretopupu.weebly.com/uploads/1/3/4/7/134769369/7488378.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_5fdae9b50fed0.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://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6a77145a8629dca98c93/1606380153092/measuring_respiration_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/implied_volatility_excel_sheet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe13994e98326c02d7d9e2/1606292377588/shape_water_cantrip.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6afd77848ba205d414585/t/5fc8a97d970db930d9c608a2/1606986109904/57008922539.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf170ef3361272aeaed0f/1606218096505/dotasapupipij.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_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 5432 bytes
SHA-256: 3b5fca1a3738f6c0ddd6432236b56570cfec3d5c1392644feccc1aba17afbc04
font_01_sfnt_off0000d94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94F 9788 bytes
SHA-256: 74bdcafe65e3fe40b4a1541ff771947ac8e18e698d79a113a01a5ec440616f39
font_02_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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