Malicious PDF — malware analysis report

Static analysis result for SHA-256 c190d16c8c77e083…

MALICIOUS

PDF

68.4 KB Created: 2020-11-20 04:21:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 12af1b68238d0193257377a9dcb5d3e5 SHA-1: ef7ae2cd2767c312618cbb8d06ad5c566f63d03e SHA-256: c190d16c8c77e083ec29fdbba91e1fe000ec84763467236bd3a4ba3589cd944c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://trafficel.ru/123?utm_term=como+funciona+un+firewall+por+software PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465719/normal_5fb4b08c59be2.pdfIn PDF document text
    • https://firerokuk.weebly.com/uploads/1/3/1/1/131164187/kupifadamuzu_fijojo.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/sokurinom.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/298342.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418558/normal_5fb59a039f820.pdfIn PDF document text
    • https://fosogaji.weebly.com/uploads/1/3/1/4/131455903/4292949.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f89db58513f4.pdfIn PDF document text
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/9551407.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481067/normal_5fb2a6b6e9d46.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/tarajix/neonatal_s._t._a._b._l._e_program.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/foods_for_pitta_vata.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/tomunutigo.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_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 5160 bytes
SHA-256: c6d578c860e3a00e2a325383f1dd98f448b4c2972c345f9a3171c794b1e01c6e
font_01_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 10844 bytes
SHA-256: 6f998f1e2037295de4bee02700ba1922b7ca18a978014c41b462d65a4a08a901

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