Malicious PDF — malware analysis report

Static analysis result for SHA-256 649ca71d01d47492…

MALICIOUS

PDF

78.6 KB Created: 2021-02-23 20:48:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f97b6a8739106ab8055df3ded7b4c855 SHA-1: 51b85e65a47ad952895e170e57f1cd5ec7ffe632 SHA-256: 649ca71d01d47492cdd33de3c3900deeb30c083e8c7a97abe5d97c4a9c971d80
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the ultimate malicious destination. The primary malicious URL identified is 'https://bologen.ru/strik?utm_term=big+green+egg+table+plans+free', which is likely used to deliver a phishing or malware payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/strik?utm_term=big+green+egg+table+plans+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405922/normal_6003edcd62ba0.pdfIn PDF document text
    • https://cdn.sqhk.co/dagosasojo/ghdAibB/the_cakemaker_film_online.pdfIn PDF document text
    • http://fapseo.ru/govamaradetagegy01s.pdfIn PDF document text
    • https://cdn.sqhk.co/legezuseg/ajiAtYt/zolibutorigopaponenuvu.pdfIn PDF document text
    • https://wujawosekeg.weebly.com/uploads/1/3/4/7/134712458/ad29d3322.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421474/normal_5fe44ac477247.pdfIn PDF document text
    • http://xudisoda.66ghz.com/15714591550.pdfIn PDF document text
    • https://lozatovetifeg.weebly.com/uploads/1/3/3/9/133999134/6568054.pdfIn PDF document text
    • http://kpovli.ru/77992800380nqet9.pdfIn PDF document text
    • https://runeburagaxe.weebly.com/uploads/1/3/4/6/134699488/xejaxemodenen.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/iiajdjj/butovavalekotutiximavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_602533c66fd19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457311/normal_5fef4e0a2517c.pdfIn PDF document text
    • https://bapamebitisetup.weebly.com/uploads/1/3/4/3/134325238/7a248483fb431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fd2dbc484da7.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/zerepuzuze/68977843122.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/electronics_mini_projects_circuit_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/potokopumiratotu.pdfIn PDF document text
    • http://siparedobapu.rf.gd/kafalowobofazi.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/indian_railway_time_table_chart_2018.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_off0000f680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF680 5260 bytes
SHA-256: 575229fac9d13a6f70046431412857c5ec3985613c527234c267e27462202d0e
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 10604 bytes
SHA-256: 795eb16a2813287204ed18d98ab3cc45684e6ad8791de5b5f30e380d9fbb3635

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