Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf7507edb2b867b…

MALICIOUS

PDF

87.7 KB Created: 2021-02-22 09:28:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8f5aaf40b2ece2698c5638f634004162 SHA-1: d78207e0c56d702b901e6b5c7daefc2700aca80d SHA-256: aaf7507edb2b867b8a99b9d792b7ff3fa0869e1ac528a389a8483d12e856bad2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malicious redirection scheme, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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=reglas+de+acentuacion+de+las+palabras+esdrujulas+ejemplos PDF link annotation
    • http://skywonder.space/what_qualifications_do_you_need_to_be_a_special_needs_teaching_assistant7qw6v.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/2388382.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/5301180.pdfIn PDF document text
    • https://pisaxegeb.weebly.com/uploads/1/3/0/7/130775455/gefowuvekobap.pdfIn PDF document text
    • https://fofezuse.weebly.com/uploads/1/3/0/7/130739341/lubetexanuwenagukeze.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/hjjfOyi/40880573808.pdfIn PDF document text
    • http://kutakelipaxeb.22web.org/86686686371.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/ghjiigw/rpg.pdfIn PDF document text
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/fawudujo_juxowolew_jukumavalovawep_dafufotag.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/Uigjihi/vemufixotakuwubifi.pdfIn PDF document text
    • http://magic-world.site/calculo_vectorial_marsden_5ta_edicion1n69u.pdfIn PDF document text
    • http://duxolaw.22web.org/finegusekelulixi.pdfIn PDF document text
    • http://inostrana.com/hard_order_of_operations_worksheetsehymg.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/19c7a.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/bL9jgw5/werewolf_camera_apk.pdfIn PDF document text
    • http://podarokinsta365.site/irregular_conditional_verbs_french_quizq1ylw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/ebook_akuntansi_biaya_mulyadi.pdfIn PDF document text
    • http://sulovibox.epizy.com/13104844660.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/bosch_gpl5_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/25984333082.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_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 5616 bytes
SHA-256: 4782dac1d71fd0fa12acaf432ad72828be7709dca61661a9487475cb4107d750
font_01_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 12808 bytes
SHA-256: 408115947269ded841faa4a61cda8afaed678783a12e4d7a5fe5efe5022a378a

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