Malicious PDF — malware analysis report

Static analysis result for SHA-256 312ec9ec88e6d762…

MALICIOUS

PDF

73.1 KB Created: 2021-03-02 05:41:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: fad6b233878900b37e3ec403267af972 SHA-1: f93fc768f668916293202d54529cb4835036c6ab SHA-256: 312ec9ec88e6d762c8d14e95a2333d36761120684fa672f6ae46987f5a1f0dc0
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious websites for further exploitation or credential harvesting.

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://leonvi.ru/strik?utm_term=medical+lab+technician+job+review PDF link annotation
    • https://mexakogu.weebly.com/uploads/1/3/5/9/135981712/6511303.pdfIn PDF document text
    • https://xalekosud.weebly.com/uploads/1/3/5/3/135350534/75af600d.pdfIn PDF document text
    • https://sinofokum.weebly.com/uploads/1/3/5/3/135316266/pudotabilat_wonig.pdfIn PDF document text
    • https://pinagoremomaj.weebly.com/uploads/1/3/0/7/130738806/rogoxa.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/cowon_plenue_d2.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/5175384.pdfIn PDF document text
    • https://segawalapuk.weebly.com/uploads/1/3/4/9/134902876/6291080.pdfIn PDF document text
    • https://movalolutipala.weebly.com/uploads/1/3/2/6/132681002/05dd9a.pdfIn PDF document text
    • https://difodofixipa.weebly.com/uploads/1/3/0/8/130814112/giribetexa.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/83072499438.pdfIn PDF document text
    • https://vewenikeluw.weebly.com/uploads/1/3/0/7/130739128/fasifivafujapaxixi.pdfIn PDF document text
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/a51400.pdfIn PDF document text
    • http://punejew.mygamesonline.org/problemas_de_solucion_de_triangulos_rectangulos.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogalibamadom.myartsonline.com/interior_design_programs_canada_online.pdfIn PDF document text
    • http://tofefovibef.rf.gd/31308557832.pdfIn PDF document text
    • http://mobukug.myartsonline.com/77357532258.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/gunuvegufas.pdfIn PDF document text
    • https://medlineplus.gov/lab-tests/how-to-understand-your-lab-results/In 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 5224 bytes
SHA-256: b6b13288b21de17baca6b853b19d7fc83468a15d841c1b812df66d993f679eff
font_01_sfnt_off0000f3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CC 10460 bytes
SHA-256: 562c7d348bf08c6338da4b436b86596bfcd13d2d01d33ff58266f971b0d8bbc6

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