Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d683f8d4ee0074…

MALICIOUS

PDF

56.4 KB Created: 2020-11-18 00:43:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e81d71b1929f236053801ab6c6edadfe SHA-1: 22965fa104c886508243593d3ebb2fddfbbdaa85 SHA-256: 37d683f8d4ee007445716722a873ccdfb0957396f58b48f69f7d91cab219e81d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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=double+sided+adhesive+sheets+clear PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479210/normal_5fb2675d63657.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/lusilataviludova.pdfIn PDF document text
    • https://nenodomamik.weebly.com/uploads/1/3/4/0/134095987/5b0ed6eb3177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_5f8b7b2118176.pdfIn PDF document text
    • https://nowakepofor.weebly.com/uploads/1/3/4/3/134369235/5193854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fa9d6a3dbb17.pdfIn PDF document text
    • https://batibama.weebly.com/uploads/1/3/4/3/134338422/loladoji.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/7806506.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/64b9bda2-e9da-4fbd-875b-c488544f82d2/84202289689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7695f733-3024-4558-af0a-a80225ac2ac4/wumapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40e46cda-5cb1-4117-9ef6-aa0769a1cf7c/51811107142.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_off0000a5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5E8 5224 bytes
SHA-256: 4ef83a052678303fcd5e708ba53117410a47d626fa2a1d879cfc8392311f3136
font_01_sfnt_off0000b7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A6 8544 bytes
SHA-256: fc83444ecaa3a25b9bb0c18ad591a6bec4744f52308a6f3a86d02e8e0bbac149

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