Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebec93f95c16559e…

MALICIOUS

PDF

71.3 KB Created: 2020-12-22 20:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5dc873c7444440b172ed85a7b1dee49 SHA-1: 181e8777bdf861aeeca321d0bcfa0f4f3228061f SHA-256: ebec93f95c16559e49dcc6aef2e5443ead6f5725b67b212ddfc09df2c0329bfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious URL that appears to be part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains text related to 'radio presenters' and 'wkhtmltopdf', suggesting a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/strik?utm_term=greatest+hits+radio+manchester+presenters
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f88a91720acf.pdf
    • https://latopilufazi.weebly.com/uploads/1/3/4/0/134017217/jetonejevenemebedebi.pdf
    • https://cdn-cms.f-static.net/uploads/4380078/normal_5fa6a610b7832.pdf
    • https://cdn-cms.f-static.net/uploads/4456999/normal_5fc0bc48839f2.pdf
    • https://cdn-cms.f-static.net/uploads/4412582/normal_5fbb30bc8544d.pdf
    • https://cdn-cms.f-static.net/uploads/4373261/normal_5fd975237c66d.pdf
    • https://delazodudiz.weebly.com/uploads/1/3/4/5/134591817/wuxobef.pdf
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5fe16c02e8f51.pdf
    • https://static.s123-cdn-static.com/uploads/4374954/normal_5fc7f490515eb.pdf
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/6aa0c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/67663d3c-3bcd-4b1e-8894-3519806b8d13/tuwibasaw.pdf
    • https://uploads.strikinglycdn.com/files/e5203ab4-f6ce-40ed-81d7-98663d14b8a5/nipobajoloxazu.pdf
    • https://uploads.strikinglycdn.com/files/b2f1b9c3-7c11-493e-91de-2e926683e77a/72581279413.pdf
    • https://uploads.strikinglycdn.com/files/abd84e97-9e8d-4fc3-9a9d-af2d43f2db81/wwi_worksheets_free.pdf
    • https://uploads.strikinglycdn.com/files/0e932e82-3afc-4c89-9d5f-15e0e57e8359/gedugutas.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.

FilenameKindSourceSize
font_00_sfnt_off0000daf5.bin
717c89ba6370d33e8c0106db720252e219cabab54ef64eef865532c5ed9f7222
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 5312 bytes
font_01_sfnt_off0000ecda.bin
7d2a4ed5ac6cc906d8eb035dfa5d159da6175ab70c380a2609601a934c456994
pdf-font-stream PDF embedded font (sfnt) at offset 0xECDA 10388 bytes