PDF malware analysis — malicious · 502de6d14934db0f

MALICIOUS

PDF

67.7 KB Created: 2020-11-24 22:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 36d3fcc0e9522561fd7004d9f08f52be SHA-1: d73b525bda1eff97905ed0af698b9272f24f4455 SHA-256: 502de6d14934db0f21cf6daa70cb4c754693e4b43b4bae8bf78ef53bea40b189

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a URL that appears to be part of a link farm designed to redirect users to other sites, likely for malicious purposes. The presence of numerous external links, many of which are to PDF files, suggests an attempt to obscure the ultimate destination and potentially host further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 5

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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 https://traffset.ru/strik?utm_term=anatomy+and+physiology+final+project+ideas
- https://cdn-cms.f-static.net/uploads/4385020/normal_5f8d8ccc3c85f.pdf
- https://cdn-cms.f-static.net/uploads/4369797/normal_5f93c2e416465.pdf
- https://fanawilixu.weebly.com/uploads/1/3/1/4/131408209/85814.pdf
- https://cdn-cms.f-static.net/uploads/4378613/normal_5f983c94af3e2.pdf
- https://vebupewisagamuz.weebly.com/uploads/1/3/4/7/134704660/womuburo.pdf
- https://cdn-cms.f-static.net/uploads/4404112/normal_5fb2a89c1a0e1.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/3aec699b-e68d-4189-b8f0-7ecf30201a04/porovifowura.pdf
- https://s3.amazonaws.com/titugome/large_manual_canister.pdf
- https://s3.amazonaws.com/gupuso/63159176003.pdf
- https://uploads.strikinglycdn.com/files/4c5d442b-a880-42a8-b3f0-5b4149abcd1b/54085463164.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cc00.bin` `ae90a1ac84fdecf27bcefa307a69074ee7cc7255f28e9db3e982fbe97f0c2c01`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC00	5736 bytes
`font_01_sfnt_off0000df76.bin` `f995b329aa6e41485ac7b0da96ed87efdfbf9a0a82d741963f1f4a2b329f4f0a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDF76	10116 bytes

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