Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e6b3c1a35b8e2f…

MALICIOUS

PDF

73.1 KB Created: 2021-03-03 06:47:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2b07967d139faff9e38294fe469bbf94 SHA-1: fe3085ad0a695a46baeea9ff3a9bfbb28b14d772 SHA-256: 71e6b3c1a35b8e2f0c0054e6703f90b0a833e73c17dfbddc816585f9ac67342e
164 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, with a critical heuristic firing for a 'PDF_SEO_LINK_FARM'. One of the primary external links points to 'https://xezojetit.ru/strik', suggesting a phishing or malware distribution attempt. The ML classifier also flagged the PDF with high confidence. While no scripts were extracted, the presence of many external links and the ML detection strongly indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xezojetit.ru/strik?utm_term=feast+for+crows+audiobook+narrator PDF link annotation
    • http://nuloriwilorij.scienceontheweb.net/saduridibawajofo.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/g0fhjja/video_calling_samsung.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/fgenZii/whatsapp_y_messenger_rooms_integration.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/wedorodokawewivi.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/nurarenosotifijiwelido.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/9281606.pdfIn PDF document text
    • http://itash.space/kendrick_lamar_i_remember_you_was_conflicted_poemzjqbu.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/lixuzo/how_to_pair_3m_worktunes_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/82676397095.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/mystic_messenger_zen_guide_day_2.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/buvobimumirisak.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/jaani_dushman_old_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/2010_buick_lacrosse_cxl_owners_manual.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/history_of_indian_art_book_class_12_in_hindi.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_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 5232 bytes
SHA-256: 5b1df010a9c244b09e5cbaf3667c0cc16c0eb61564040de0db76f4a07b23b55f
font_01_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 11288 bytes
SHA-256: 3f29176b3ee750e343ecfe069a8aee2c1ff2f6b5d2b75cc7dba5d0950a86325a

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