Malicious PDF — malware analysis report

Static analysis result for SHA-256 083d533a02eefbaf…

MALICIOUS

PDF

159.4 KB Created: 2021-02-20 04:37:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f66102e48549b0a3541f535b88b8d777 SHA-1: 2357b9d9258eebd4fc7739a6455881e20c674b91 SHA-256: 083d533a02eefbafcce2796bba103d2b49dc69cc7df54cc5f4dc55699e272872
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be junk data, but the presence of multiple links to disposable hosting and redirectors strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=human+depend+on+environment In PDF document text
    • http://akfb.online/sutabaxilabibamrxylv.pdfIn PDF document text
    • https://cdn.sqhk.co/gitogozune/ifhaHjc/35509204987.pdfIn PDF document text
    • https://cdn.sqhk.co/kobedobofepo/ijj8kIk/70s_80s_90s_music_trivia.pdfIn PDF document text
    • https://cdn.sqhk.co/jiwonukunav/2Pw5rjg/53183262207.pdfIn PDF document text
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/4601400.pdfIn PDF document text
    • http://meblik.su/zombie_royale_warzone_tipsvj2ro.pdfIn PDF document text
    • https://kikitepolo.weebly.com/uploads/1/3/4/5/134514310/jolafomu-medor-jalinobipurere-lesaneluwe.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/pawefitakibaneg.pdfIn PDF document text
    • https://pexulowiseguwuz.weebly.com/uploads/1/3/4/3/134391342/majewudivimijopunin.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/wezilovezo.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/9475724.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/Nhhgdjj/39052088033.pdfIn PDF document text
    • https://kefavobora.weebly.com/uploads/1/3/6/0/136010588/3347786.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilutuve.rf.gd/40494733084.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/informacin_de_serpiente_de_cascabel_en_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/fikavogix.pdfIn PDF document text
    • http://busimutu.epizy.com/dobabeliwexopu.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/april_gate_apax.pdfIn PDF document text
    • http://tijiwef.epizy.com/verbo_aller_forma_negativa.pdfIn 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.

FilenameKindSourceSize
font_00_sfnt_off00023642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23642 4916 bytes
SHA-256: b2e327cb4d59f376da45fc48fd35daf3f66ad684d60964006819c8170cfcdd1f
font_01_sfnt_off000246e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x246E4 12452 bytes
SHA-256: 2ed01d8398b4f3397d146ec2074fc91fb944c175d9f99a00963d7c691efedc57

Open this report in the interactive analyzer, or submit your own file for analysis.