Malicious PDF — malware analysis report

Static analysis result for SHA-256 e10bad4aad7aec64…

MALICIOUS

PDF

61.4 KB Created: 2020-11-22 08:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9d6d50c7dbae881303adeee202982b5d SHA-1: 121cb65bfc1f2276f7cd30f7837cbccd26dfe18d SHA-256: e10bad4aad7aec64cfa2e93fe5ab87bee038cdeff6f98ecc99e293efea82e03b
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 by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The document contains a large number of embedded URLs, many of which point to PDF files hosted on various platforms, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection further support its malicious nature. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://ggtraff.ru/123?utm_term=black+cool+math+games+level+15 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f8a6e551ce2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407062/normal_5f9bee6001757.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_5f99b5982dc2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410431/normal_5faf970724a75.pdfIn PDF document text
    • https://baxojozejaxofo.weebly.com/uploads/1/3/4/5/134586757/bikob.pdfIn PDF document text
    • https://sigogaxeba.weebly.com/uploads/1/3/4/6/134620414/b98ea99c4a14a.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/1435747e-af45-478e-9afd-0ba2a5433d94/view_private_snapchat_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e7f1de-0746-4e5b-94cf-89ce68fb1f40/80929573268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702ee346-b63e-401d-bb85-ddabd9e895f0/94669042888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a415ac2-1e3d-452e-b4b1-c78963e2f2d6/solanetarefukepipatijuna.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da68e563-6272-4c86-a1d6-2faffbcccf0e/rexed.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_off0000a685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA685 5100 bytes
SHA-256: e9304ad37bdf5777fa68917abdd4b1978447d1c24907de377d6c5b87cb4b80a3
font_01_sfnt_off0000b7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FA 10260 bytes
SHA-256: 94543d4ddc62f801df77df7f2198cdeebbdfefc35048547943cc2d3cd66bad3e
font_02_sfnt_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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