Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7eb938050cfcaa3…

MALICIOUS

PDF

71.7 KB Created: 2020-11-18 11:16:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: cc26d371227627862f01aad84a24a76a SHA-1: b891d17e5324704c298e337c4fe4f5a509d340a9 SHA-256: c7eb938050cfcaa35c6dace77e9038165b36285c610a88b5000e852505768ab8
164 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 are to PDF files hosted on file-sharing services, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious document designed to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://trafftec.ru/aws?utm_term=autocad+2013-++free+trial-+cad+software-+autodesk PDF link annotation
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/5611845.pdfIn PDF document text
    • https://raminatu.weebly.com/uploads/1/3/4/5/134579417/3528769.pdfIn PDF document text
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/4010f08d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_5fa2a59dd5990.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/f0436d57ef2522.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/cf87cceb-159f-4d52-a90a-61307b213376/sisewudevuxoxeluzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71ed9fba-f90a-46fc-9fc4-e1529ca93429/brian_s_winter_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ae59f6-330a-4c3d-8ba3-407c8f2763bc/12236729144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4a9425c-2564-4d8a-8b33-8d84f097ca33/pujunejowotugipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a833db22-4f33-4c03-8319-cb7522e48a6d/molabevoseji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8F9 5460 bytes
SHA-256: 08764516c3d34d1a627f22b70cd1c4806dd0499e95df631274f228e78d8e1496
font_01_sfnt_off0000dbb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB9 11232 bytes
SHA-256: 3685ca801b189840686baefd5c3638ae2276f4ace006dc5f4f3c3b4215b84e55
font_02_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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