Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3950fa1b8d8f5d4…

MALICIOUS

PDF

70.4 KB Created: 2020-12-22 05:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7a66c88a295c3f11bfc1617bd0c72ba1 SHA-1: e0cac2cc6c67cb3f6c7e7d707e5ad1aae43305d0 SHA-256: c3950fa1b8d8f5d46043a2416106256a9e0082abd8e7dafdcee8e2f3da0a9f2c
186 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 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?utm_term=babalos+snow+crystal+lyrics+full+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5fa2284de3073.pdfIn PDF document text
    • https://kisuguwaki.weebly.com/uploads/1/3/4/3/134388310/3222081.pdfIn PDF document text
    • https://waridiregap.weebly.com/uploads/1/3/4/0/134095836/mupexopapawikujomupe.pdfIn PDF document text
    • https://jaduxopedarev.weebly.com/uploads/1/3/4/7/134749363/b7da2e.pdfIn PDF document text
    • https://guxolufesa.weebly.com/uploads/1/3/4/4/134468064/xilakawobalu_jowatatalig.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/6271526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370309/normal_5fa21bb829878.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415937/normal_5fc3d1bb24d7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/283a802a-94b7-4f1f-9ab1-c0feddc4f1e2/26225342507.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf6661a-e89d-4beb-abd9-1fb7616f1741/cbind_in_r_different_length.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_off0000d59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD59B 5432 bytes
SHA-256: 8427b7047d67c647cb5ce8de5974abdb08470e665bebf9b3eabc9849d6f62980
font_01_sfnt_off0000e846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE846 10876 bytes
SHA-256: b1685d569ed00bdd443178213d22cb1ba8759021c39b8d11fdc220797b35c5ce

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