PDF malware analysis — malicious · c76708a3136c869a

MALICIOUS

PDF

77.5 KB Created: 2021-03-20 11:00:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 6c8ab3ce897355779c626acd7ce7f4e5 SHA-1: 731c6bc9fc6d79575bcea3f09681bd67204fdcf0 SHA-256: c76708a3136c869a463a6fbf0a3896410109ad212b54be640209003d20e76dfb

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('vilenefex.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple PDF links, further suggesting malicious intent. The ML classifier and ClamAV detection strongly indicate this PDF is malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 5

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 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://vilenefex.ru/strik?utm_term=curso+de+ingles+mensalidade PDF link annotation
- https://cdn-cms.f-static.net/uploads/4460476/normal_603fb0d7a0c36.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369516/normal_6009ecb814ff4.pdfIn PDF document text
- https://cdn.sqhk.co/xibetevoxaj/jegeHid/prison_break_characters_real_names.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4500201/normal_5fd238ef327be.pdfIn PDF document text
- https://cdn.sqhk.co/xugiwatokax/rGjbia2/quran_recitation_with_english_translation_free.pdfIn PDF document text
- https://cdn.sqhk.co/jawuraxexije/jjhjZM1/3479914162.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454425/normal_60190a79c31f2.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://sobenikirija.rf.gd/conclusion_for_hotel_internship_report.pdfIn PDF document text
- http://sufumawug.epizy.com/kidobelezuvumibozibafo.pdfIn PDF document text
- http://vuremekewema.rf.gd/36665610693.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/796e5d13-fdaa-4c51-9c26-99dd59f005d9/rajorukalulawegoju.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e1a9902e-3a78-4110-924c-d183e1609b15/18371443026.pdfIn PDF document text
- https://f59c0a4d-c104-43ac-8966-a5978cdf1b8c.filesusr.com/ugd/0c1ebd_fdbeb17664034128ae7a13d2ec5afc7d.pdf?index=trueIn PDF document text
- https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_ef8d37df1b444937ba31240d8b7f1e44.pdf?index=trueIn PDF document text
- https://c3e22df6-b199-4cd4-80dc-afe7b42bde8e.filesusr.com/ugd/3254bf_0afa94757a364e2c8f3d93c04c15d6ef.pdf?index=trueIn PDF document text
- https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_ae8a9ed3e8af490791d1774fc8aea21b.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zafijukopa/17349752107.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cf91679f-5c91-46f6-b955-9df814afa97a/95634632355.pdfIn PDF document text
- http://gogefesepokap.epizy.com/bsc_1st_year_maths_book_solution_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/58fb2e62-8803-4805-a92d-16e2e18501c6/xezimumexazifexaviripo.pdfIn PDF document text
- https://s3.amazonaws.com/zabevog/sintra_tourist_guide_book.pdfIn PDF document text
- https://s3.amazonaws.com/julexekubaj/bachelor_pad_economics_audible.pdfIn PDF document text
- https://da5bec28-7969-4117-8ffb-5069fce5e80c.filesusr.com/ugd/31593d_45970ba72abb495f95bee57c0bf923c4.pdf?index=trueIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In 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_off0000ee05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE05	5052 bytes
SHA-256: `01fa08b63c285e39add1b0b9c6b476088e31d42c507723e696c9b7eb950dbcab`
`font_01_sfnt_off0000ff11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF11	13044 bytes
SHA-256: `88d1747b6909822347b5eb40b4a2bd7c94d0d6e39f96ad664fe5ceffc0b5b4a8`

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