PDF malware analysis — malicious · a0cc00b749130a4f

MALICIOUS

PDF

67.9 KB Created: 2021-04-26 02:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29

MD5: 3341c65356f81c1bb3e298fc480c88ab SHA-1: 58d17f088b8f590b97c3650fb7207889896f3262 SHA-256: a0cc00b749130a4f3f892b35385b4015cf3cc3e089449944084fbc7150869ff1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised legitimate websites hosting PDF files, suggesting a phishing or credential harvesting campaign. The document body, though heavily obfuscated, appears to be a lure related to carburetor cleaning, aiming to trick users into clicking the malicious links.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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 http://www.sumnercountyhospital.org/sites/default/files/webform/xubapubawaral.pdf In PDF document text
- https://ambrose.edu/sites/default/files/webform/42416127327.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/48232920683.pdfIn PDF document text
- http://pilgrimland.com/sites/default/files/webform/resume-uploads/41345860665.pdfIn PDF document text
- https://ambrose.edu/sites/default/files/webform/kubuxodadiwozubak.pdfIn PDF document text
- https://www.osgeurope.com/sites/osg-corporate.dev/files/webform/19824824677.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/A3Ryygt5BCM/uplcv?utm_term=toro+kohler+6.75+149cc+carburetor+cleaningPDF link annotation
- https://gradfutures.princeton.edu/system/files/webform/xafuzekimizitigemuseli.pdfIn PDF document text
- https://printandmail.princeton.edu/system/files/webform/zixulupuritijidegebi.pdfIn PDF document text
- https://drones.princeton.edu/system/files/webform/xakunowegetudirojevogejiw.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_off0000c998.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC998	5720 bytes
SHA-256: `bd5eed86bd47bdb6b4ca433e6559311b3a220ba595604a3ed5a2dbe329aa5602`
`font_01_sfnt_off0000dd24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD24	11076 bytes
SHA-256: `23e2a1df46dbff5390513c4224ae8f74fb155e7b04828332d61560cf2f71e894`

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