Malicious PDF — malware analysis report

Static analysis result for SHA-256 6796d1e5971dfd9e…

MALICIOUS

PDF

73.5 KB Created: 2020-12-31 13:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 46bf1ca1607d38b19e3bf383f0c7a900 SHA-1: 017bfef3adf34199db849c4ff1bfbab17a0bee2c SHA-256: 6796d1e5971dfd9e0c4cbaddfc532e52181c185b05b3bbc764f636cfa9742404
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or a method to obscure malicious content. The primary URL, 'https://trafffe.ru/123?utm_term=typographic+design+form+and+communication+pdf', is likely used to redirect users to a malicious site. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links, coupled with a high ML classifier score and ClamAV detection, indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=typographic+design+form+and+communication+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5fdaf9c841fab.pdfIn PDF document text
    • https://saxunada.weebly.com/uploads/1/3/4/8/134865385/nesamoxu-pojaxibozinuvob-pipafi.pdfIn PDF document text
    • https://jipunexekamu.weebly.com/uploads/1/3/4/5/134588935/toxamo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5fb4fbe00524c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408593/normal_5f92a3fc55447.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5fa6ee3c224b2.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/petubapizo/romidorigox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c62bf5-cb68-4698-bce7-7af1a8a01749/fetemebofewizogado.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/bokunoneku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1180287f-9d5f-4df8-a097-5b4da7a2055b/85712027460.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/xufiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2597f252-d53e-4c42-a63e-6e798f9369ac/predators_gold_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/fegawirugazexudiwidegad.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_off0000e22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22C 5588 bytes
SHA-256: 8c5a3a922edcc498a0daa95ec75231b16b2378a918270b2d84665f72b279fa31
font_01_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 10884 bytes
SHA-256: 3f51d7a36dc1dcc5fe3ca47d3569fa0634ef2e78e1cb50d211f772695be8742f

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