Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad42f86fdf41a1a0…

MALICIOUS

PDF

80.2 KB Created: 2021-04-02 21:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 1c64fc2b72463134a7d37199a08b9ed0 SHA-1: efefacbdfc6e1b09a83dc909df2415ae9b441d8d SHA-256: ad42f86fdf41a1a034d048f50a64c78647eb33568b8af5562a587f958cd6c4ea
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/strik?utm_term=how+much+do+medical+examiners+earn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4461773/normal_5fdb58b9588f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485163/normal_6002205dd6a3f.pdfIn PDF document text
    • https://vepezoroz.weebly.com/uploads/1/3/4/6/134605761/7752040.pdfIn PDF document text
    • https://soputepitup.weebly.com/uploads/1/3/5/9/135973261/0dd6e69691b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464539/normal_5fd13ad5c3275.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/66096743401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fd0f218bc4b7.pdfIn PDF document text
    • https://rupimobo.weebly.com/uploads/1/3/4/8/134891389/senasavum.pdfIn PDF document text
    • https://lalusilimedam.weebly.com/uploads/1/3/0/9/130969483/dafodup.pdfIn PDF document text
    • https://tebivozov.weebly.com/uploads/1/3/2/7/132740763/tokixamirero-josominokodemu-rojonap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493905/normal_6015f35419ba9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368229/normal_603b499c5ca96.pdfIn PDF document text
    • https://lizotolagodega.weebly.com/uploads/1/3/4/4/134495854/xuxukada.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/noam_chomsky_who_rules_the_world_review.pdfIn PDF document text
    • https://wudigunufite.weebly.com/uploads/1/3/4/6/134611509/3113744.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368497/normal_60645a88626c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466413/normal_5fe5d5eb72138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_6059b4a4f0aed.pdfIn PDF document text
    • http://ziwewixowele.sportsontheweb.net/declutter_your_mind_sj_scott.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_7574fed2a45347779ed8bd0404d0fd44.pdf?index=trueIn PDF document text
    • http://sofibimibojas.myartsonline.com/nakezufog.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_09643c0275694c31b919d3d2d58ed75b.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.

FilenameKindSourceSize
font_00_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 5300 bytes
SHA-256: fc57eb6a66844471290eca71a38467eda2a09a26aa6fcc69516efd95a074e3e3
font_01_sfnt_off00010f2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2F 10584 bytes
SHA-256: 07b388856b00bfafb4160b9925bd0e929da0b39aa80fb9477405c459a24a05fd