Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd51bb9f1fcf4b48…

MALICIOUS

PDF

79.5 KB Created: 2021-04-02 23:56:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 90eea82b6db192893e776a61b7aaee89 SHA-1: 30ed26483827d86c36eca01bb13fb5b3a97338f6 SHA-256: bd51bb9f1fcf4b48d3fb4b160cc09b63e7f8c3796bcbd4b2c7554c23c2330f9e
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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.
  • 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://seumenha.ru/wix?keyword=ionic+and+covalent+bonding+practice+worksheet PDF link annotation
    • https://wovofonunubani.weebly.com/uploads/1/3/1/4/131408017/saginigodagu.pdfIn PDF document text
    • https://cdn.sqhk.co/kewesowovim/f2HjfJq/tivutubevi.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/biomedical_engineering_research_projects.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/8Gl9dc5/live_sports_tv_android_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/takulowizi/gghaPYD/air_attack_ads_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zesozote/ihj5QQB/zovuposogobuzoler.pdfIn PDF document text
    • https://cdn.sqhk.co/leguzufaju/ifREggO/musica_italiana_clasica_instrumental.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvojeve/1kQjfhh/manuale_casio_cdp-_200r_italiano.pdfIn PDF document text
    • https://cdn.sqhk.co/vawadawuleja/ctghEwy/best_free_streaming_apps_for_android_tv_box.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/vulebotiwifilimaten.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/eifIiiS/nozaxixedimodaxavevojate.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/international_finance_management_mcq.pdfIn PDF document text
    • https://sokikafumuwo.weebly.com/uploads/1/3/4/6/134697409/14bad1e9b73.pdfIn PDF document text
    • https://vezijukifi.weebly.com/uploads/1/3/3/9/133997169/7144700.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/wupuxus/barcode_scanner_using_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/numegubowalonan/wosugamopazu.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_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 5628 bytes
SHA-256: 21897c1ebe66d861b49e0e6924e7248b11ce50285cdd012f6e32749d66034ea9
font_01_sfnt_off00010a38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A38 11220 bytes
SHA-256: ad82e374693f2abf047ed9e93578e6fe01c96ad4a196e37a3adf9c9f32fc2062

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