Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9495d6bd9fa148…

MALICIOUS

PDF

70.1 KB Created: 2020-11-14 19:45:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 900b39c12b4ac9af511be742aed213da SHA-1: d7ad639240dfa76822a72fca4072a1b5dd6f3cbd SHA-256: db9495d6bd9fa1488bb3d7b751b537a2ecbff7d9f73d6c37f61d9f249be8f9ea
214 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?utm_term=az-+100+exam+questions+and+answers In PDF document text
    • https://bekefopu.weebly.com/uploads/1/3/4/6/134692172/3552274.pdfIn PDF document text
    • https://joluduloj.weebly.com/uploads/1/3/4/2/134266967/ddd45e9123ae00.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/334cd7e.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/be802fd979.pdfIn PDF document text
    • https://wixurawitubeza.weebly.com/uploads/1/3/4/3/134319602/78d022a711.pdfIn PDF document text
    • https://gobexuxiwabi.weebly.com/uploads/1/3/4/3/134372757/b8a2176fb.pdfIn PDF document text
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/9a3bc4d0092e6.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/jenagubadopi/3211871835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1519f73-2a04-4449-a125-84a0ae8c73ab/18848879489.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa294fb8-a5f7-4989-b406-9cfa448cff1f/kanikanum_neram_mp3_ringtone_downloa.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/hamilton_beach_6_slice_easy_reach_toaster_oven_with_convection_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/teclado_emoji_keyboard.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/danezose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36083c85-21dd-4763-ac99-3c098c717ecd/lekejibopifona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a41a5d-61fa-45dd-a54f-ad87553992a0/two_phase_simplex_method_example.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/altivar_process_630_manual.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_off0000d519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD519 5492 bytes
SHA-256: 00eecdc2bf85079495e254bfc27f232e17a8f0787b1d85b1c3614057f4a1f90b
font_01_sfnt_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 10296 bytes
SHA-256: 2ab7a2abf0a0564bca9a309388474eab3d7944e7fb2ad0ea659361840879090b

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