Malicious PDF — malware analysis report

Static analysis result for SHA-256 92231b19d4e45cab…

MALICIOUS

PDF

66.7 KB Created: 2021-06-11 11:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 87cca60b8271238399f0b79b1f2b3781 SHA-1: 1157f3b42b47b1ccdf5ed5dd60d1f0fd5b7892d7 SHA-256: 92231b19d4e45cab16ed9415d7038a55acfeb47eb2d48e19cfe6cb4819b152db
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://crysiq.ru/pbw?utm_term=musclebob+buffpants+full+episode PDF link annotation
    • https://witirasa.weebly.com/uploads/1/3/4/5/134525236/2672e49b3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478125/normal_5fca7cd6495f8.pdfIn PDF document text
    • https://napuguzexavuzes.weebly.com/uploads/1/3/4/8/134875267/gafigamutaxa.pdfIn PDF document text
    • https://mifanupomiseri.weebly.com/uploads/1/3/2/6/132681757/5073665.pdfIn PDF document text
    • https://zelewebekosol.weebly.com/uploads/1/3/4/6/134638009/582b7a2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_60b8fbe52e2ab.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/dc63d828-766e-4ba2-9d31-f3e347ecf6cf/employee_insubordination_write_up_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16d31f0-c179-4808-bf3d-9c788c41d2ae/65111652742.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/can_you_unlock_terminator_mk11.pdfIn PDF document text
    • http://zobafolu.pbworks.com/f/12th_std_biology_textbook.pdfIn PDF document text
    • http://zilebunod.pbworks.com/f/seminar_report_on_autoclaved_aerated_concrete_blocks.pdfIn PDF document text
    • http://rixepal.pbworks.com/f/download_grand_theft_auto_san_andreas_v1_05_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dd4aeac-59f9-444d-878a-33c200c5303e/analysis_of_alum_lab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e9084dc-ced0-4e6b-9e04-74b2b61b8da7/65179058004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8cc6ab6-7b47-4564-9e0c-53596a7d1eac/lerazeruran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5f8aa0-373f-4da8-b7bc-2996f2f15c0a/66822366286.pdfIn PDF document text
    • http://wemekojezum.pbworks.com/f/75044217774.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_off0000c72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72F 5200 bytes
SHA-256: 54184fa9a75395178ea2675e0176c0233aca93953e1f1b2bad69b76debacb6ec
font_01_sfnt_off0000d8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FC 11004 bytes
SHA-256: 657a73c2062cfb3fd02742b1b774b3017a26651a54a9f86407ac6b9f09dd1a13

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