Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf512b6d95d6c76…

MALICIOUS

PDF

86.1 KB Created: 2021-03-14 06:10:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 9c4db8d2f2559ea3cb0e305d5e394c8b SHA-1: 3d6c376470ef4c900544415c02bae8ef3bdf9107 SHA-256: 8cf512b6d95d6c76a04695b6a9dfcb79fda410f5abee876c3e232ecdf19368a3
214 Risk Score

Malware Insights

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

The sample is a PDF document flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL identified is 'https://yafferge.ru/wix?keyword=distance+on+the+coordinate+plane+worksheet+answer+key', which is likely used for redirection or phishing. No scripts were extracted, but the PDF structure itself is being leveraged for malicious purposes.

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
  • 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://yafferge.ru/wix?keyword=distance+on+the+coordinate+plane+worksheet+answer+key In PDF document text
    • https://nasuvanebi.weebly.com/uploads/1/3/5/3/135393195/019ee30a78d7829.pdfIn PDF document text
    • https://pazolumaf.weebly.com/uploads/1/3/4/3/134356568/kaderakaxuv.pdfIn PDF document text
    • https://wururozudarorar.weebly.com/uploads/1/3/1/3/131380521/ea895369d98e.pdfIn PDF document text
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/b33ab3e8ef5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/jim_boone_pack_line_defense.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/illustrator_marketing_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/test_ingresso_scienze_della_formazione_primaria_bergamo.pdfIn PDF document text
    • http://roromopenofo.epizy.com/advanced_financial_modelling_in_excel.pdfIn PDF document text
    • http://kuzebelinebofe.epizy.com/zolufuvux.pdfIn PDF document text
    • http://redanewirejawub.epizy.com/mevozapigavun.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/32456616962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30e858db-5ef9-450d-9ff0-22aca9d28e50/how_to_draw_a_male_fashion_figure.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/wesunoxofoxaxole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9460ba4-091c-43f3-8316-f6c12a92fc15/21500095702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b391aaf5-59fe-44b1-9ff2-f3fd6abdf11e/fawadonovolarudagupadene.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/alessandro_zanardi_information.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/jerusalem_on_high_hymn_music_sheet.pdfIn PDF document text
    • http://juzatapanosuwi.rf.gd/babawopimuxaresatuxeza.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_off000110be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BE 5416 bytes
SHA-256: acc18231c909783968d8ad396eff1567d8f3c63b34dff0d76f32186a5be70b3e
font_01_sfnt_off00012340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 11588 bytes
SHA-256: f786cefffede29d6a2ffea2025c87e21472c34c422f972bb4b14597f0fa07dfc

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