Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a09ffc45ddc1cb…

MALICIOUS

PDF

85.5 KB Created: 2021-02-22 23:30:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2241003b9c4fbe872c8c7eb828676c94 SHA-1: 3ef73c4dc5c457487dd54a70b77dca22bc7f9197 SHA-256: 52a09ffc45ddc1cb9624220e4fe1f88c9eb1913d70749aae4a2f4f9a370be532
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'Robin Hood' and movie streaming, suggesting a lure to entice users to click on the malicious URLs. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=robin+hood+prince+of+thieves+full+movie+watch+online PDF link annotation
    • http://eurozone.pro/69143619920u1ygc.pdfIn PDF document text
    • https://xilamexazoleguj.weebly.com/uploads/1/3/2/6/132695560/99151.pdfIn PDF document text
    • https://vifazadaza.weebly.com/uploads/1/3/4/8/134883600/sugago_dapupo_vojub.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/abec23b693a67d.pdfIn PDF document text
    • https://zegabanibo.weebly.com/uploads/1/3/5/3/135339571/suxizuk-xavusogatifi.pdfIn PDF document text
    • http://mishgen.com/596215881731hxag.pdfIn PDF document text
    • https://luvofebujapima.weebly.com/uploads/1/3/0/9/130969865/fc186b.pdfIn PDF document text
    • https://nezopubetuw.weebly.com/uploads/1/3/2/6/132681339/zevetezujobasikifara.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/vofadoloves/58062082501.pdfIn PDF document text
    • http://lamerowed.rf.gd/2277682132.pdfIn PDF document text
    • http://majilutiwuxas.rf.gd/28694756151.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/cupom_de_desconto_analise_informatica.pdfIn PDF document text
    • http://mifijikamipupu.epizy.com/durham_report_due.pdfIn PDF document text
    • http://resibokut.epizy.com/54428973292.pdfIn PDF document text
    • http://wojemegakal.rf.gd/free_basketball_background_templates.pdfIn PDF document text
    • http://zugotival.epizy.com/59042098253.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_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 5692 bytes
SHA-256: 8d758e2ba0ba619083a6b289e10bf246c1a4e5f35f9bc1e178f990d8986da112
font_01_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 10520 bytes
SHA-256: 4b8f723d9558ff1e51c4616279a41855ea5b58f1c415478f062f87e7db138f51

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