Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e9f993cdbf7e68…

MALICIOUS

PDF

76.0 KB Created: 2021-02-19 05:10:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 10086aa40dedfa8ac5f6458da1e78628 SHA-1: d5f9d22fde7d28aa77fc88e3089cddc092d9b89e SHA-256: 41e9f993cdbf7e681beb691604e08797286beff84941b962557153629efc815d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'link farm', suggesting an attempt to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

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://jottigo.ru/123?utm_term=example+of+social+cleavage PDF link annotation
    • https://cdn.sqhk.co/dubutemaruxu/jhhcjj1/fulotuzoxadugupejaduxefo.pdfIn PDF document text
    • https://cdn.sqhk.co/pexejaxer/hj4UTge/guzusefefopotitom.pdfIn PDF document text
    • https://salobejutar.weebly.com/uploads/1/3/4/5/134589592/5915511.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/nufobigepedigetinima.pdfIn PDF document text
    • http://vsedlyatebya.xyz/captive_prince_volume_3tcg7f.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/kabisebax/camtasia_studio_8_portable_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/falaziwopekuzejotuti.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/3134608787.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/xadedudinegizokovabitib.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/varices_esofagicas_tratamiento_nutricional.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_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 5324 bytes
SHA-256: a001337115b30a41c31a2d56868d68de92d8b5f66a29a5d552119bcb1e7eb6d8
font_01_sfnt_off0000fe02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE02 10944 bytes
SHA-256: 3f67c4a6e51873799e65a95b2a0496c9d3fe7233ed21d7b905bdd98bede6f5d1