Malicious PDF — malware analysis report

Static analysis result for SHA-256 963eccb72de2e80d…

MALICIOUS

PDF

93.0 KB Created: 2021-03-31 12:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f859f3cd56f0304f9c4e47b81fff01ab SHA-1: 51f433aaf025efaafddaa7ac0ec65a97b280a055 SHA-256: 963eccb72de2e80decaa01bc1f6cba1fe7d3464a0de058dbbe6de6d7277b48a5
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'vilenefex.ru' and others to potentially malicious domains, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/123?utm_term=agent+sai+srinivasa+athreya+movie++isaimini PDF link annotation
    • http://yourcy.com/forward_financial_bank_onlineclz46.pdfIn PDF document text
    • http://simultaneously.space/how_can_i_boost_my_fios_wifi_signaljwajs.pdfIn PDF document text
    • http://uaregroup.com/67814006944j8bzg.pdfIn PDF document text
    • https://cdn.sqhk.co/gixixutiji/jchb3ic/2538599298.pdfIn PDF document text
    • http://zahlungsservice-ch.site/31959312196j3moi.pdfIn PDF document text
    • http://fineagencyy.com/frosty_the_snowman_hat_templatee7bs7.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/bbiahbl/carpet_cleaner_rental_kroger.pdfIn PDF document text
    • http://rafale.store/visolidipemebedisipavurlg4rd.pdfIn PDF document text
    • http://gufutaca3.xyz/guidelines_of_dealing_with_customer_complaints_effectively9admr.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/carrier_ethernet_for_dummies.pdfIn PDF document text
    • https://cdn.sqhk.co/wetiniwem/i7ib1RC/constructed_response_worksheets_5th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://d8d078ea-10ec-4787-8e21-ef6e32b87a24.filesusr.com/ugd/8f6098_f39cb1db5d26446e90fdacf7ad7dd481.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_0f14b5f9759546b295f42aa88ff1433d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefabe/vorakizasik.pdfIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_6822dfbdb19a40e7867cae1689333548.pdf?index=trueIn PDF document text
    • https://b1fdf235-84a1-4479-ba44-7fc4a4f983d7.filesusr.com/ugd/afcd87_adb458ca79214ffa97b8e905697228fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/almaany_arabic_arabic_pro_apk.pdfIn PDF document text
    • https://4647adb0-9c01-46a1-aef1-4380d5873f13.filesusr.com/ugd/edb4a7_2db5d7b3e6ae4c31b15c3cd8a9a5a776.pdf?index=trueIn PDF document text
    • http://tuxefunuzire.atwebpages.com/zipusafapenejifet.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F6 5220 bytes
SHA-256: e58baa4a11c5630cb439a8694cda2242104d77ec1d8513d0b3aa7ca9d5157b59
font_01_sfnt_off000102a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A0 9148 bytes
SHA-256: ca3fa1df27f3da088b1914c6358b3d8f3f396765d2aabd82537370427ad43fca
font_02_sfnt_off00011da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA0 1940 bytes
SHA-256: 3f23ae85e37b15402f879ea150537e7cb0ed239a072db7b6928757f1c19d6afc
font_03_sfnt_off000126ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 11144 bytes
SHA-256: ac5cab72946d6bf09f930a4da48cf98663d28b027272a6f738d0120477186f76
font_04_sfnt_off00014d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0A 16620 bytes
SHA-256: 29a205a83e21c7d3d57a66956e14b654e144ca30d1d8e59c2a4dbb0ab3a91885