Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83e115291aabc7a…

MALICIOUS

PDF

61.5 KB Created: 2020-12-22 09:47:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: faf5717d6b6a70885ff847c3772d896e SHA-1: 62a7a4f57f25c014695432d9d9effa7b2768c37e SHA-256: d83e115291aabc7a44fcf3ba72d905c8c895daa2af7f7688a5284305e7a5b2ba
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, indicating it is likely a phishing or SEO spam document. It contains a large number of embedded links pointing to external websites, including a known malicious redirector, suggesting an attempt to drive traffic to malicious infrastructure. The document body is heavily obfuscated and appears to be junk data, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/strik?utm_term=derwent+watercolor+pencils+36+set In PDF document text
    • https://vokefepafox.weebly.com/uploads/1/3/4/3/134333292/lirovon.pdfIn PDF document text
    • https://xenafakawipa.weebly.com/uploads/1/3/4/8/134879239/2785533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383678/normal_5fa0446ebb6c2.pdfIn PDF document text
    • https://jagotizepevex.weebly.com/uploads/1/3/4/4/134464701/7aca8f10.pdfIn PDF document text
    • https://dowuxagexejilen.weebly.com/uploads/1/3/4/7/134719956/wesinolixoziwen.pdfIn PDF document text
    • https://fakoronad.weebly.com/uploads/1/3/4/7/134712901/9455399.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f8bd6add69c7.pdfIn PDF document text
    • https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/vasinajete.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/terugimexixak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5fb82c86ed8c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426059/normal_5fc6764ca8d9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369183/normal_5f87f8b9d111b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf58ee9d79364840854ace/1606375663625/laterally_supported_beam.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_off0000b48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB48F 5336 bytes
SHA-256: 03d60f05ef5bf91c2532563c63419710f51dc6eb2566d1ee73898d936434669c
font_01_sfnt_off0000c6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 10128 bytes
SHA-256: a6d42c42f5f88cb9b58a95fe8a850963ec1f482c417736ddd73934c55d466793

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