Malicious PDF — malware analysis report

Static analysis result for SHA-256 da4516e0cd9a610c…

MALICIOUS

PDF

76.4 KB Created: 2021-05-22 15:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d8763a6ff491668a37e1da83560d12a2 SHA-1: 70a7df0d5ee5e687132ed295148995d33fcb17dc SHA-256: da4516e0cd9a610c9efdab8af2e7e47f604df4a7f2708cf765c9c53fcc3758b6
156 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 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
  • 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://vilenefex.ru/strik?utm_term=siluetas+continentes+para+imprimir PDF link annotation
    • https://jizonuwuko.weebly.com/uploads/1/3/0/8/130814311/jakujisod.pdfIn PDF document text
    • https://tutitobogin.weebly.com/uploads/1/3/4/4/134485970/a1a8f0d587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405652/normal_602ef140a934b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6045e8fcaef89.pdfIn PDF document text
    • https://kaginugopaz.weebly.com/uploads/1/3/4/3/134310825/vinero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fe8293a5aa0a.pdfIn PDF document text
    • https://vomuribo.weebly.com/uploads/1/3/1/6/131607062/515335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_6030a0dbd2c93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458413/normal_5ffac1f96c0fd.pdfIn PDF document text
    • https://tadadali.weebly.com/uploads/1/3/4/0/134095934/damedogi.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/dd87f3c5-a64e-497b-a3b8-547290f7376d/honda_1000_generator_oil_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ccd1c6-befb-4c03-b304-a59020ff963e/how_do_i_export_garageband_to_mp3_on_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/the_descent_of_man_chapter_4_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/english_word_meaning_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c687a082-1cc3-4f58-aea1-98e18632e51c/34355037497.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/fodupamanomumenirab.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/pabobetokazur.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/where_does_bootcamp_windows_support_software.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/whatsapp_status_malayalam_free.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_off0000ebca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCA 5180 bytes
SHA-256: 3267b0bcdaa0a37831754f3365da0bcb7ab9ea9a2ccf5dd47e52595b66d750ae
font_01_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 11596 bytes
SHA-256: 42bd9fc6f52e17df42308a3f95f2657be8e85d9ad2de8fe8f5ace3a0fc2bd256

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