PDF malware analysis — malicious · 3e398db2e78ab9da

MALICIOUS

PDF

66.7 KB Created: 2020-11-24 23:30:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b5b8fbe477df72ac4cd3e88f8ddb92c6 SHA-1: 75ed35e2c264d7d8f08c14eb577bdbbbed1798da SHA-256: 3e398db2e78ab9dac554162440ebff5d0f9026e74c7352159fb11ca5d38dbdb5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM and the ML_NYX_PDF_MALICIOUS classification strongly indicate malicious intent. The embedded URL `https://trafffe.ru/strik?utm_term=no+bones+about+it+science+olympiad+practice+test` is likely the primary destination for the attack, disguised as a practice test.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://trafffe.ru/strik?utm_term=no+bones+about+it+science+olympiad+practice+test
- https://cdn-cms.f-static.net/uploads/4382627/normal_5faafda95a702.pdf
- https://zimazegikej.weebly.com/uploads/1/3/4/7/134732290/wagezowarufugir-linidogofovuji.pdf
- https://posilopawirina.weebly.com/uploads/1/3/4/3/134353572/lemorisame-tudofetowexu-letejil-sumov.pdf
- https://zibaxewax.weebly.com/uploads/1/3/4/6/134699960/416615.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/nazekisigiduz/how_to_measure_anything_in_cybersecurity_risk_1st_edition.pdf
- https://s3.amazonaws.com/jozetej/morte_na_praia_agatha_christie.pdf
- https://s3.amazonaws.com/nafoxuda/crossrail_delay_report.pdf
- https://s3.amazonaws.com/zijivevip/bedroom_design_books.pdf
- https://s3.amazonaws.com/jafujasiwetid/ruwomelaluziwijorafiduka.pdf
- https://s3.amazonaws.com/fejakixoweka/loomis_sayles_strategic_income_fund_fact_sheet.pdf
- https://s3.amazonaws.com/bededuxotulapil/31641079042.pdf
- https://s3.amazonaws.com/gelawiweza/powilogexagasot.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_off0000c643.bin` `6fd49ec4340c1c541397f88b381a6db2f70f4f2541d4d96021b429edfffafb93`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC643	5432 bytes
`font_01_sfnt_off0000d8ab.bin` `5d6f5e7ffefa4124740721c58dfbd73a02ab427eab10883c7fd51309d640261e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD8AB	10968 bytes

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