PDF malware analysis — malicious · 41efc847c2130cf0

MALICIOUS

PDF

74.7 KB Created: 2021-04-26 07:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29

MD5: 3e60e227ade7c27b51029fc185fd0425 SHA-1: 2338731c17ad136851bd6d538c450da0fd18eb5b SHA-256: 41efc847c2130cf0039069afd35de8ae5246a51df09cd2e8ca6a4d9aa2e7c84c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document that contains embedded URLs, one of which is flagged as potentially malicious. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'Korean language learn pdf', likely to trick users into clicking the embedded URL.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://ambrose.edu/sites/default/files/webform/58588935603.pdf In PDF document text
- https://www.blplegal.com/sites/default/files/webform/julojulixizegusu.pdfIn PDF document text
- https://www.afscme65.org/system/files/webform/52844377902.pdfIn PDF document text
- https://www.dgs-interparts.be/sites/default/files/xufatonapa.pdfIn PDF document text
- https://www.pharoxglobal.com/sites/default/files/webform/balulata.pdfIn PDF document text
- http://www.friendlycc.com/sites/default/files/webform/topevonizudurazot.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/28961662769.pdfIn PDF document text
- http://cicatsalud.com/html/sites/default/files/webform/32675510575.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/48232920683.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/99544266771.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/fabifuturofutip.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=korean+language+learn+pdfPDF link annotation
- https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/8342566550.pdfIn PDF document text
- https://campusrec.princeton.edu/system/files/webform/rilawadabovoxilezevateg.pdfIn PDF document text
- https://campusrec.princeton.edu/system/files/webform/7624886728.pdfIn PDF document text
- https://minorsoncampus.princeton.edu/system/files/webform/jawugu.pdfIn PDF document text
- https://community.princeton.edu/system/files/webform/wijudabopijobomoxusosul.pdfIn PDF document text
- https://lib.asu.edu/system/files/webform/nexeginexepor.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dbaf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBAF	4756 bytes
SHA-256: `c98362520e3fe6287a0824658a8f00865d623363842364f2c22b55e49e5e3319`
`font_01_sfnt_off0000ebe4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBE4	10460 bytes
SHA-256: `1be5849f81f08c2c08add679c96e403caec772c36adf7c909361adf993ce94df`
`font_02_sfnt_off00010fb4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10FB4	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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