Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a057c1b20f4f625…

MALICIOUS

PDF

95.4 KB Created: 2021-03-02 04:46:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3f534f9a11b3454d1edc333e0a46091e SHA-1: 5355c9014d7b655d9ebeb9f158ad581ef333a132 SHA-256: 5a057c1b20f4f625a8373be677381b623f9667a726d1fb80ed159048a31c598d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as document titles, indicating a link farm or SEO poisoning attempt. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially malicious sites. The presence of multiple external URIs and the ML classifier's high confidence score further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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=ganapathi+sahasranama+stotram+in+telugu+pdf PDF link annotation
    • https://kapuwibipu.weebly.com/uploads/1/3/0/9/130969563/1651489.pdfIn PDF document text
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/lubobusulivuxi-kotebixavuko-soxumomexu-ratotarakiv.pdfIn PDF document text
    • http://lnstagram-office.com/cyber_dragon_duel_links9l0if.pdfIn PDF document text
    • http://dkblogin-de.best/koxisofusow1b9ff.pdfIn PDF document text
    • http://zuluwana.iblogger.org/thamballapalle_weather_report_today.pdfIn PDF document text
    • https://vaxulazazoju.weebly.com/uploads/1/3/4/5/134587837/jigipofiwivexek.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/vatokaw.pdfIn PDF document text
    • http://vkysnaya-eda.site/xibulefadww5e0.pdfIn PDF document text
    • https://jurisosisirebak.weebly.com/uploads/1/3/6/0/136086550/xojadabokepe.pdfIn PDF document text
    • https://fadunununi.weebly.com/uploads/1/3/4/7/134747036/miwufavenax_kamolekixo.pdfIn PDF document text
    • https://wuzezabor.weebly.com/uploads/1/3/1/4/131438899/417dcb8278ca0f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexizel.epizy.com/digital_photography_high_school_curriculum.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/42296066520.pdfIn PDF document text
    • https://s3.amazonaws.com/toniseligiwuzux/30450681036.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/zubuxifovutefopakuzufipe.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/10686804674.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/66335776884.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/hubspot_sales_funnel_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/wemipenexotutorabi.pdfIn PDF document text
    • http://lubesugoninop.epizy.com/xogogolunamu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD9 5488 bytes
SHA-256: 913ea5f46e465894a4247aeb2703aa1991490a493d3200d84c2f3fe9dbb50915
font_01_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 13912 bytes
SHA-256: 6a20690974a0f88fc64476afde80256d85badea680c0c5c61141d1e44abceec1
font_02_sfnt_off00015772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15772 16376 bytes
SHA-256: 01578362ccdb9871bb3da30e333cacfddfc8a40f3e41d506ada37db06e086127

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