Malicious PDF — malware analysis report

Static analysis result for SHA-256 34ef8ab743459c81…

MALICIOUS

PDF

85.8 KB Created: 2021-03-15 19:13:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82c8445d811dc4662df0bde868a51a7a SHA-1: 7467bb115f3353b47f05fa812a2c9141bf83a005 SHA-256: 34ef8ab743459c8143aeafed8fa2d9566b5d9e40eb6aa38cc57bdc23d8b3e173
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 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classified as 'Pdf.Phishing.Trojan'. The embedded URLs point to suspicious domains, further supporting the phishing and malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=duplicate+trong+google+sheet
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/xuvife.pdf
    • https://vobikonim.weebly.com/uploads/1/3/5/3/135390296/rekuzowune.pdf
    • https://bosewumakujo.weebly.com/uploads/1/3/6/0/136036310/0466415858ebe.pdf
    • http://lezobul.medianewsonline.com/basic_english_conversation_questions.pdf
    • https://static.s123-cdn-static.com/uploads/4377912/normal_5fdfd562822ec.pdf
    • https://static.s123-cdn-static.com/uploads/4368488/normal_5fe59a310326b.pdf
    • http://jetavof.sportsontheweb.net/67814506091.pdf
    • https://cdn-cms.f-static.net/uploads/4370057/normal_602c994512028.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gazivemon/singh_is_king_movie_filmywap.pdf
    • https://s3.amazonaws.com/pavujiniz/ruzupafa.pdf
    • https://s3.amazonaws.com/tosevud/72669867886.pdf
    • https://s3.amazonaws.com/jajuzasalikirut/asus_aimesh_ac1900_whole_home_wifi_system.pdf
    • https://s3.amazonaws.com/kosipefojaw/63733933966.pdf
    • https://s3.amazonaws.com/bokexizometun/comment_form_template_html.pdf
    • https://s3.amazonaws.com/galinikagopit/livro_adsoro.pdf
    • https://s3.amazonaws.com/jinabom/vazeniwewuxuz.pdf
    • http://gupizamowakop.myartsonline.com/daily_reading_comprehension_grade_1_download.pdf
    • https://s3.amazonaws.com/zikeko/meno_socrates_summary.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001107a.bin
901a01f965d4002d7355eaaa759d775be8b7c76b96988acd51f9ea223232d790
pdf-font-stream PDF embedded font (sfnt) at offset 0x1107A 5196 bytes
font_01_sfnt_off00012223.bin
3a1c54965879cc2f04e60ff02c4ef7f208fa3202ee26987fa6c1a4679fa0d853
pdf-font-stream PDF embedded font (sfnt) at offset 0x12223 11860 bytes