Malicious PDF — malware analysis report

Static analysis result for SHA-256 df43382caf69fc25…

MALICIOUS

PDF

71.9 KB Created: 2021-02-24 11:01:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e5510fc296aa01e49a083c959c940a1b SHA-1: 289e2541df3832355675901f9c695ee655022942 SHA-256: df43382caf69fc25c6e0e7eddb508ce6955b56727c3cdccd237c973b9cfb6533
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL disguised as a software download link. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure tactic. No scripts were extracted, but the PDF structure and external URL suggest it's designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/strik?utm_term=proficy+machine+edition+software+download PDF link annotation
    • http://grafoanaliz.ru/dituxaremg4cux.pdfIn PDF document text
    • http://rusakova.space/minhajul_abidin_imam_ghazali3rxqh.pdfIn PDF document text
    • http://allostar.buzz/vumesofojadovovswel.pdfIn PDF document text
    • http://tryse.xyz/how_much_do_doctors_get_paid_in_nigeria045gd.pdfIn PDF document text
    • http://winfreeiphone.xyz/2017_ford_gt500nhy6l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393036/normal_6021001e07741.pdfIn PDF document text
    • http://donbetosstreettacos.com/pagujozepepavntobb.pdfIn PDF document text
    • http://kvyovk.xyz/7457750306kssbf.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/bomifabipi/breakstone_cottage_doubles_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/32824177836.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/sonadekujidizito.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/fomejupuwutopajibeni.pdfIn PDF document text
    • https://s3.amazonaws.com/jidagafinuxesu/davubaragexowamalera.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/47839633200.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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 5456 bytes
SHA-256: a330d2c9d391c25e67c39d275fdd52e7e366df7ad30018909bffcafa036fc5fc
font_01_sfnt_off0000ed24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 11196 bytes
SHA-256: 3a68d808447d343b63aa58314c68f8355089cbcc6595a8030307b998f9c1819c

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