PDF malware analysis — malicious · 9c10e2eff99f7b78

MALICIOUS

PDF

66.5 KB Created: 2021-04-19 16:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29

MD5: 5a8f9565dc5e9c888b1b790a5a7e6825 SHA-1: a520d5a54460e203e342ce2621cd319e2e915ee6 SHA-256: 9c10e2eff99f7b785fefd9807d775a4c0905d04dd465f8eb5e37b72033d03e0d

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains embedded URLs that lead to other PDF files, suggesting a multi-stage attack or phishing campaign. The document body, though heavily obfuscated, hints at a lure related to 'advanced excel skills', which is a common pretext for phishing or malware delivery.

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://web.liderpapel.com/sites/default/files/webform/wavunivuzabanovomid.pdf In PDF document text
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/35757612566.pdfIn PDF document text
- https://www.jts.org.jo/sites/default/files/webform/96043924660.pdfIn PDF document text
- https://www.dgs-interparts.be/sites/default/files/viwiredozilopuvotudulufez.pdfIn PDF document text
- https://natsihwa.org.au/sites/default/files/webform/mufuwujaxerafesa.pdfIn PDF document text
- http://www.pbttphtk.gov.my/sites/default/files/webform/1232685222.pdfIn PDF document text
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/99469138220.pdfIn PDF document text
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/3563422068.pdfIn PDF document text
- http://cicatsalud.com/html/sites/default/files/webform/21030689395.pdfIn PDF document text
- https://www.dgs-interparts.be/sites/default/files/36138637258.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/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+advanced+excel+skillsPDF link annotation
- 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_off0000c659.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC659	5232 bytes
SHA-256: `73516d95447261254a0cc680d6d66175e55f578e5a8ac936fc8631296940cb31`
`font_01_sfnt_off0000d831.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD831	11092 bytes
SHA-256: `d6c6919bacc460ce2d4de34587871eea8fa651f37c73bb5f0e3a2eaa667e8bf6`

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