Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c6eaa61acee682…

MALICIOUS

PDF

71.8 KB Created: 2021-02-24 10:51:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 23ca6365e0ff437c071089ee4506bc8c SHA-1: 525510b420f024861796418acb674b8fdb68343c SHA-256: 52c6eaa61acee6827bf8f29b8278d656430e236ce4a9b43e8f2d1804bd2bdf3a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized to appear as legitimate search results, including one for 'practice problems sex linked genes worksheet answer key'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wix?keyword=practice+problems+sex+linked+genes+worksheet+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484093/normal_603150660325a.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/da6ead53d63724e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476946/normal_5ff7ba9a8f6ae.pdfIn PDF document text
    • http://thiswaytovogue.com/bcd_adder_verilogw5854.pdfIn PDF document text
    • https://gokixojegesefa.weebly.com/uploads/1/3/4/8/134864476/pavimuregapixop-bufilin-dufubapep-rowovopobixeda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450507/normal_6025c6ece898d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482207/normal_5fc5f908660e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491148/normal_5fccacc74d49d.pdfIn PDF document text
    • https://jagefebasedi.weebly.com/uploads/1/3/5/9/135993187/zeroxakog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_6001d9a0d55fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5fd885621434b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370529/normal_5ff177256b6d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_601e32c216c06.pdfIn PDF document text
    • http://thedefenseforge.com/creo_sheet_metal_extrudeqthd8.pdfIn PDF document text
    • https://tererenigi.weebly.com/uploads/1/3/1/4/131405956/3912729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426687/normal_600eaa41d147e.pdfIn PDF document text
    • http://kismykeitio.best/zenakiriguketevopilvu6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://falagisorinawe.rf.gd/grammar_gerund_and_infinitive_exercises.pdfIn PDF document text
    • http://lurebilowate.rf.gd/2012_honda_civic_service_due_soon_a12.pdfIn PDF document text
    • http://lijukogibedatu.epizy.com/daily_machine_breakdown_report.pdfIn PDF document text
    • http://meguwuzib.rf.gd/cliver_tv_apk.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_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 5952 bytes
SHA-256: a7f5a5b0c56255f54f315d4892afa74e30feee9aeb6099a5fb9751d45b582c48
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 10332 bytes
SHA-256: cb466e50bb432167049b562ace81a196a7674d02c602bea0e410eb87cac71efa

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