Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad1e5c343cc6f886…

MALICIOUS

PDF

63.8 KB Created: 2020-12-17 07:19:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 44f8dc8b69b1204ce2bd13a41159f20b SHA-1: e6bad0057244b880faf9ef75e3ddf236a176d239 SHA-256: ad1e5c343cc6f886e64cb6b461c7b46d1b2b2c909b25c05225f95e35c71b91fb
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lead users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffi.ru/aws?utm_term=dyersville+iowa+hay+auction+report PDF link annotation
    • https://fofifiso.weebly.com/uploads/1/3/4/6/134613093/4583271.pdfIn PDF document text
    • https://lisiladojorinin.weebly.com/uploads/1/3/0/8/130874519/mipijevufegiwilemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482191/normal_5fb43dbc406c1.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/depopetuvubimudej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f914da8a3c79.pdfIn PDF document text
    • https://wivixilor.weebly.com/uploads/1/3/4/3/134371520/nuribilira-zutotiridovug-nanum-visezinolu.pdfIn PDF document text
    • https://kapizufon.weebly.com/uploads/1/3/4/4/134486886/2499973.pdfIn PDF document text
    • https://gigemapafinul.weebly.com/uploads/1/3/1/3/131398374/lorelexilip-zirutofuwupupi.pdfIn PDF document text
    • https://pewixuzapama.weebly.com/uploads/1/3/4/6/134655392/9405513.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/a1c7a9ed-f814-4b10-9d2f-7ed2f641bcb0/mutually_exclusive_worksheet.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_off0000bcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB4 5276 bytes
SHA-256: 0bdc89c90556e726168f6f43463413415163822fd5263061963a5218008741ff
font_01_sfnt_off0000cec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC4 10508 bytes
SHA-256: 3b8b29ab13d032f00de0358ef3d87a326c0b8d4a3210a0e811ed92686c072681

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