PDF malware analysis — malicious · a4c86527fa8b1399

MALICIOUS

PDF

59.0 KB Created: 2020-12-11 18:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 09b574c0cf651c8168f592f0b1604c7f SHA-1: a1cb88971cd7cca4be316b5285178ae5543ed465 SHA-256: a4c86527fa8b13996fd65ccb3cdad7255bc66393ebb94fb70d4caa6c7bd907e3

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://trafffi.ru/wb?keyword=participial%20adjectives%20free%20worksheet', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded links point towards an attempt to redirect the user to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9854

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
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.
External URI info PDF_URI

PDF contains an external URL action
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://trafffi.ru/wb?keyword=participial%20adjectives%20free%20worksheet PDF link annotation
- https://zabuxowinuj.weebly.com/uploads/1/3/4/8/134874463/roboraz.pdfIn PDF document text
- https://wekegakusujesal.weebly.com/uploads/1/3/4/2/134266445/wofeluxumuzopen.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/fasotajedag/pg-8x_free_vst.pdfIn PDF document text
- https://static1.squarespace.com/static/5fc3205912facd59cebb7138/t/5fc4a0fff3de5e49b5f81d22/1606721792405/85681730188.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3f1539ad-7fe8-47ec-b84d-5f8bcae82488/petolimikado.pdfIn PDF document text
- https://static1.squarespace.com/static/5fc0f88bd26ff1194f740ef3/t/5fc9f47a2e4d7f67ca2ee8f1/1607070844318/72916140103.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ce1931dc-adfc-432a-b434-cf04ebd86efa/kavexikemukaputamife.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9de20cc0-e06a-4d26-8818-65e904c7ad8f/99907337691.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/40c96324-f080-4b83-949a-2c0cec6119bc/domilusuvokusurowajoxut.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f09c9287-12b4-4231-b5e9-9042c96e18cc/lodig.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9b8e44e7-e03b-440a-b66a-1c912c8f8572/28904163148.pdfIn PDF document text
- https://s3.amazonaws.com/bidurudilidujug/tibowivaxetezirofuvuzixod.pdfIn 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_off0000ba6e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBA6E	5536 bytes
SHA-256: `69118a4459d44535786b14e079443ca499b2acf92b8ae6d2699a34679ba7e8d2`
`font_01_sfnt_off0000cd58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCD58	10172 bytes
SHA-256: `eabe810a49b0c696710719fe8dade74c9212807cb8f6490f08df24a0380a85dd`

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