PDF malware analysis — malicious · 8c61b90ba6316a86

MALICIOUS

PDF

58.7 KB Created: 2020-12-17 23:50:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 291428af60c048f7e088174930b3d83f SHA-1: 64857fd859d6737e87889c79faccef89adf69d8f SHA-256: 8c61b90ba6316a86da4a8bbf4ec1d37b5140f4c8888a08a2e0cf603fcea78021

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to Weebly domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically a phishing or trojan threat. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/123?utm_term=ultra+boost+cream
- https://kutesavakelex.weebly.com/uploads/1/3/4/3/134336058/246ec3b484.pdf
- https://cdn-cms.f-static.net/uploads/4401517/normal_5f98ecdf64c86.pdf
- https://toripifisesu.weebly.com/uploads/1/3/4/3/134367164/xorajetalu_vibajimi.pdf
- https://xaverawigidun.weebly.com/uploads/1/3/4/4/134437914/6429c7.pdf
- https://cdn-cms.f-static.net/uploads/4384851/normal_5fadd71f4e874.pdf
- https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/metedidizuj.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/143058a1-2dbe-4547-97b1-89131af04235/dish_1000.2_eastern_arc.pdf
- https://uploads.strikinglycdn.com/files/cdf37962-4ba7-48cd-93ab-4e5af16415b4/ryobi_brush_cutter_saw_blade.pdf
- https://uploads.strikinglycdn.com/files/7b36521a-cf41-4aa0-b703-ae74fd0fbbe5/pizza_perfect_menu.pdf
- https://s3.amazonaws.com/fejatepudopito/siwolijod.pdf
- https://uploads.strikinglycdn.com/files/3cd41d58-4cdf-4151-aea3-5964c0d6b55a/lasodosa.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_off0000aa8a.bin` `b996bc4f52f8c435b46f54da833549ba5d8d085b07ad829f9022bc841f813ff5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAA8A	5076 bytes
`font_01_sfnt_off0000bbb4.bin` `3cae67378426b39541c387f89bb878ef046c15cc1fb1e39b725aa4af843010ed`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBBB4	10240 bytes

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