Malicious PDF — malware analysis report

Static analysis result for SHA-256 83dcb9c772d7161c…

MALICIOUS

PDF

69.5 KB Created: 2021-03-14 13:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f865d4aca2447a8617c8b440f839b840 SHA-1: 95d38669443a64427202edb1daf1a726703da0d4 SHA-256: 83dcb9c772d7161c29cfe8dc2b0e16a51b318cbe46ecb61f8e8ad540b7fd17a3
156 Risk Score

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 0.9997

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://soxebez.ru/123?utm_term=decimal+worksheet+for+class+6+pdf PDF link annotation
    • http://gosoxegekiri.mywebcommunity.org/fofok.pdfIn PDF document text
    • https://zenanewexakidop.weebly.com/uploads/1/3/5/3/135310893/xajus.pdfIn PDF document text
    • https://gozibaduvixumu.weebly.com/uploads/1/3/4/6/134628844/pibeduj.pdfIn PDF document text
    • https://sisexalixigana.weebly.com/uploads/1/3/5/3/135323773/nalozuranajadulata.pdfIn PDF document text
    • http://kerosijuvibeg.scienceontheweb.net/tokakek.pdfIn PDF document text
    • https://nanuvofekoredam.weebly.com/uploads/1/3/5/3/135385966/f90b032b6fcfa96.pdfIn PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/bimigumivijola.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/ladiwuzetawedi/clarinet_sheet_music_for_silent_night.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/synthesis_essay_example.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_b263009abeaf4097a620a278252c6294.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_bd508b6756104486832d25a1b3764c4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/wokejakutumizixupamuzel.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/comberton_village_college_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/foporob.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/sexually_transmitted_disease_surveillance_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/mivokozibu/99314339308.pdfIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_b992981c27044f429ee7e2687d9e9d8f.pdf?index=trueIn PDF document text
    • https://7e005a1c-fb68-43c1-af83-b854b6a2d282.filesusr.com/ugd/dcfb95_2b80843141a1489caf37f7162b27cca4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dabatisew/anjathe_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/rasubuw.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_off0000d1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DD 5704 bytes
SHA-256: 9c782742297bf1df6475842f406afa1fb22468aee66e58f92780948a553d5ec4
font_01_sfnt_off0000e533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE533 10460 bytes
SHA-256: cf089b97619a6894e92ece3e026331e5b88a9192f72e8339e50121771fdf7e42

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