PDF malware analysis — malicious · c23a88fa44585872

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 08:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: c289bb9a112ddf627a70860e6e1b5778 SHA-1: 2e9d570bea065b442000a5cd4bb623710ce0c0af SHA-256: c23a88fa445858721d2244dc47075c9646c62d88cf91cfed549c6fc6eb2f19cc

266 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1553.005 Security Software Installation T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. It contains a link farm and instructions to disable security software, suggesting a phishing or social engineering attack. The presence of embedded URLs and the overall structure point towards an attempt to trick the user into downloading further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 8

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
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://jacksth.ru/strik?utm_term=xilisoft+divx+converter+license+code
- http://saxobufamap.22web.org/7221367916.pdf
- http://figironeme.22web.org/management_information_systems_graduate_jobs.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://6448a590-b571-4b71-a9e4-820b8531b153.filesusr.com/ugd/782be2_af154c9479304cd6a3a4f98d453533ca.pdf?index=true
- https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_6ca4ff4799ec473aae1321644bc16734.pdf?index=true
- https://uploads.strikinglycdn.com/files/59b4b71b-2a57-435c-9e91-0c33cbc4bc5a/garmin_vivofit_3_bands_jb_hi_fi.pdf
- https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_ad31652eda474bd7bf11b4746f05ac9d.pdf?index=true
- https://c72a6d71-2fad-4f5a-8b7a-a7c165485bce.filesusr.com/ugd/a4966f_d49bb1100f254d02aab45ff0fdf350db.pdf?index=true
- https://s3.amazonaws.com/sepawi/equidad_de_genero_libro.pdf
- https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_6192c1a4b48948948eb8e7e3351ad04c.pdf?index=true
- https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_db5bf99e0eeb40cfb4a19707dd67285e.pdf?index=true
- https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_daf18fb29cbf4a768f7322ddc16446e7.pdf?index=true
- https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_904b46a106b0429db369d26959cf6533.pdf?index=true
- http://fakuzilezozo.epizy.com/supervisor_interview_questions_and_answers.pdf
- http://fisetefukuwod.rf.gd/ice_white_outdoor_icicle_christmas_lights.pdf
- https://s3.amazonaws.com/nefunupu/child_support_agreement_template_texas.pdf
- https://uploads.strikinglycdn.com/files/296f4705-d374-4636-8908-6e5e59fd6c4e/why_my_bluetooth_is_not_charging.pdf
- https://uploads.strikinglycdn.com/files/47f097df-a433-4b5f-b546-961741be2a4f/medenuvogava.pdf
- https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_b8aeb24f1595465b816eda111edf7b15.pdf?index=true
- https://uploads.strikinglycdn.com/files/04cb44cc-7513-4ad6-803c-67c2691a22c9/how_to_make_remote_control_helicopter_at_home_in_easy_way.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_off0000f02e.bin` `64a6964f5242fa69859d70f73910517375b5a97aa8dc2ff6b18496ad31cf456f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF02E	4912 bytes
`font_01_sfnt_off000100fa.bin` `1b2913dc3673fa4644ad1bd137df7e2b478542b6746affa1824e4d881d9ecaa6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x100FA	10816 bytes

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