Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a3deb6ff09a895…

MALICIOUS

PDF

69.6 KB Created: 2020-12-07 08:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b52ae010d6433f0e1a4e310744b7f488 SHA-1: 91443960e7804dcff9aeb2b5d0645ffba980f3c1 SHA-256: 36a3deb6ff09a895513ea80464db26af80d393723734a460ac67e0eda63d3a36
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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://traffine.ru/strik?utm_term=california+probate+code+trustee+duty+to+account PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387033/normal_5f8cb8a3c8a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_5fb6bbc098551.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f974af1d6264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371013/normal_5f884897aed21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fbe1c3de6f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403680/normal_5fcba7b943d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420448/normal_5fb9e16f50fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5fc754844fe92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459170/normal_5fcb9a625c61d.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/pesegisekojen.pdfIn PDF document text
    • https://jameguvifipud.weebly.com/uploads/1/3/4/7/134771166/ff4c976.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/5fc1138816f6d44b07bfcb5c/t/5fc1e3ba3c02f22b9d51e2f6/1606542266769/82747974862.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cbc7c6d964583621a279/t/5fc99e928d0ac92c7bdd330b/1607048851891/kuloxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1377f0a7-4d68-42b7-b40f-a10237383cef/wukafatafeveruzedoz.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_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 5296 bytes
SHA-256: 8db355bb5290825eb7befecfe0050b0930bd1f606c417a69cd04f783d6265073
font_01_sfnt_off0000da97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 9504 bytes
SHA-256: 9f1906337b5153a51214d192af4d6320f08dc73eda1070fb852a25195742f105
font_02_sfnt_off0000fb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB07 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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