Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee99b55c6d249b3…

MALICIOUS

PDF

84.5 KB Created: 2021-02-16 02:35:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 78714c667e03a9f731999a215b9d5402 SHA-1: 636db087693a34f1497756ac342572a2f54a8e77 SHA-256: cee99b55c6d249b3d97c389cef0b96380b3e9c4fd41b319c7c8dbf39901f5f4b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/123?utm_term=suunto+ambit+watch+strap+replacement PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375073/normal_6006365216d36.pdfIn PDF document text
    • https://jazigibebegada.weebly.com/uploads/1/3/1/6/131606339/bixuxax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496148/normal_6018be7a6bfe0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_600cf926b5855.pdfIn PDF document text
    • https://ragojozuzaz.weebly.com/uploads/1/3/4/6/134668900/9306455.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393900/normal_5ff2e13d47635.pdfIn PDF document text
    • https://zowololo.weebly.com/uploads/1/3/5/2/135294949/tuzapiko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_5fd9ddada8503.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/jaghmii/free_casino_slot_machine_games_to_download.pdfIn PDF document text
    • https://cdn.sqhk.co/midubevine/hfUigsA/fepuwujemezemurotuva.pdfIn PDF document text
    • https://gozataxuwo.weebly.com/uploads/1/3/0/7/130740141/82df8d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450354/normal_60212a5045f89.pdfIn PDF document text
    • https://surugatolezijef.weebly.com/uploads/1/3/4/6/134631687/3840884.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 5508 bytes
SHA-256: bbe9373bb34ff29c7d68ccae4d838795210bcb80bd4d42cef21b835917602f89
font_01_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 11040 bytes
SHA-256: 074ecc5826ac99b68bd06e69318a081665b963310a0efc7ee1b43fec7ff16869

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