Malicious PDF — malware analysis report

Static analysis result for SHA-256 4169e592942d980a…

MALICIOUS

PDF

86.4 KB Created: 2021-03-02 10:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1813e5882c4a996c3ef49a6a70205c4f SHA-1: 95b8bca81f9219c639f64560f8e734b0abd0c661 SHA-256: 4169e592942d980ab73753ff0d58c7e1cdcf3b4e51c9b838b9930a04c24fc837
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

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.
  • 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://fokemale.ru/strik?utm_term=oracle+database+basics+ppt PDF link annotation
    • http://vifezitenof.getenjoyment.net/was_the_progressive_era_really_progressive.pdfIn PDF document text
    • https://puwoposujol.weebly.com/uploads/1/3/0/9/130969317/goputowuvuxejum.pdfIn PDF document text
    • https://wisowoturap.weebly.com/uploads/1/3/1/4/131453432/eb0db63.pdfIn PDF document text
    • https://cdn.sqhk.co/wetabupi/ifghgcf/masterchef_yeni_fragman.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/iffggSo/4_immagini_1_parola_6_lettere.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/jbqENiE/7425919881.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/g3nghia/83506041471.pdfIn PDF document text
    • https://cdn.sqhk.co/nevupediwix/ZEhbwid/cowboy_chicken_menu_and_prices.pdfIn PDF document text
    • http://italystore.pro/red_alert_2_free_download6tptd.pdfIn PDF document text
    • https://nivumumati.weebly.com/uploads/1/3/4/7/134703955/8426158.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zovixis.epizy.com/management_accounts_pack_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/budget_speech_2019_highlights.pdfIn PDF document text
    • http://jiropikadebu.epizy.com/la_motivation_des_actes_administratifs.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/actualiser_tableau_crois_dynamique_google_sheets.pdfIn PDF document text
    • http://lanadofebanubod.epizy.com/free_sample_curriculum_vitae_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/vlookup_example_two_worksheets.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_off00010e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1E 5236 bytes
SHA-256: f5d28c8a13160aa2e7c7bfba2c747feb7da6567f2f04b2f57b15123351c79cde
font_01_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 14164 bytes
SHA-256: cd4d22385437e98c239d5b6767aa9d51824b98ba4c5539dc321cd4dfbf612b0a

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