PDF malware analysis — malicious · 4e6772750450f494

MALICIOUS

PDF

71.8 KB Created: 2021-04-15 02:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 306834b634e239d4a83f1e8520a5fb62 SHA-1: 58039b4aac11d44a0467a05b55eb7c0589bf4b9e SHA-256: 4e6772750450f494d7c8d5f0cf72fe86406b076a911f9d54b3f40cc6dfdd3028

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains embedded URLs, one of which is presented as a lure for 'best book for data structures in c pdf'. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content or initiate a download, aligning with phishing and malware distribution tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://www.dgs-interparts.be/sites/default/files/64751185730.pdf In PDF document text
- https://grossenbacher.co.nz/en/system/files/avoidance-training-certificates/95133977644.pdfIn PDF document text
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/vonasajevevedatenalezeb.pdfIn PDF document text
- https://www.dgs-interparts.be/sites/default/files/muvok.pdfIn PDF document text
- https://www.mothercare.ro/sites/default/files/webform/resumes/28941778760.pdfIn PDF document text
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/tafunowusovuna.pdfIn PDF document text
- https://www.afscme65.org/system/files/webform/baxuwobokorexifiri.pdfIn PDF document text
- https://www.woonsocketri.org/system/temporary/webform/mupiroto.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+book+for+data+structures+in+c%252B%252B+pdfPDF link annotation
- https://ec.europa.eu/eip/agriculture/sites/default/files/webform/72323592377.pdfIn PDF document text
- https://ec.europa.eu/eip/agriculture/sites/default/files/webform/66140853426.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000de3e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE3E	5368 bytes
SHA-256: `59f312901facfe8648df05264c7fdeb0bc202732dba33164b30c86e762c473b2`
`font_01_sfnt_off0000f091.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF091	10132 bytes
SHA-256: `69a41a2b5bf2947d269bb5fe30d44a7306b6a566b4839c6940d2372eb8a5f456`

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