Malicious PDF — malware analysis report

Static analysis result for SHA-256 64502bf5ccceaee7…

MALICIOUS

PDF

114.0 KB Created: 2021-03-11 14:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d4f4531b2de247d6f8c3aa5ca4fb48b9 SHA-1: 91ec17a5db6f5a01391505d0039cbc8512a433d9 SHA-256: 64502bf5ccceaee7aeef3c6426dd51d16728e5abaae42f89e00a5d8a849eebd1
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-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://botokaw.ru/strik?utm_term=how+to+get+a+commercial+driver%2527s+license+in+michigan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500877/normal_6039703f88b9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd634052296d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_5fd0eaf941898.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_60098c32ef134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490250/normal_5ffc96e0aab48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387712/normal_5fd15ec9c6e5e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fe573402e6e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_60257a6410d63.pdfIn PDF document text
    • http://natlab.ru/t_rex_simulator_mod_apknq3zo.pdfIn PDF document text
    • http://1xbet-registr.site/raguneferutexj55vl.pdfIn PDF document text
    • http://pisibebix.22web.org/performance_standards_for_antimicrobial_disk_susceptibility_tests.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/nida_audition_monologues.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409236/normal_5fe4161710a5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_b98daf11cfcf477c9394d716df04f939.pdf?index=trueIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_d14290a7b44549a49c26837e7f38f27c.pdf?index=trueIn PDF document text
    • http://sudajakabeba.epizy.com/21567576034.pdfIn PDF document text
    • http://bewaxupu.rf.gd/que_es_agorafobia.pdfIn PDF document text
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_258e308c8265457b94abde51ce564bd8.pdf?index=trueIn PDF document text
    • https://87c8fc71-818b-4167-bf0d-2ac3bc49ffd1.filesusr.com/ugd/f9d4cd_bbc9857b8b194620b4cd84764ec0f365.pdf?index=trueIn PDF document text
    • http://widifusi.myartsonline.com/85838338767.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_off00017d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D0E 5500 bytes
SHA-256: 19f7a4f9aed1e3fec299210e6f011de7102b710d87c533d284e6ceb49cea3b6e
font_01_sfnt_off00018fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB7 12776 bytes
SHA-256: de6966867366455ab3ac927ecd6269e1d6f84fc912df5c89a8ac7770171f4bc7

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