Malicious PDF — malware analysis report

Static analysis result for SHA-256 23c659a0488631ef…

MALICIOUS

PDF

104.0 KB Created: 2021-02-25 12:00:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: de33112d86d210e107234d350a44da12 SHA-1: 3d09fcaa3c884971e8f2a917add67353b591c252 SHA-256: 23c659a0488631ef0c8263da617ec9c4e4ecaab006da79950d8d8af6036ef192
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for link farms used in phishing or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites, aligning with spearphishing attachment tactics.

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://maypoin.ru/strik?utm_term=what+do+the+egyptian+symbols+mean PDF link annotation
    • http://scrlt.xyz/74203069293y3uk7.pdfIn PDF document text
    • https://cdn.sqhk.co/xolanikipiz/ii61ifA/super_skill_pinball.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/ixihhiu/51031491103.pdfIn PDF document text
    • https://cdn.sqhk.co/fezusife/kjiWAdo/tejujelajajubokigam.pdfIn PDF document text
    • https://cdn.sqhk.co/mogudekusab/eghzhjz/sorumamizigez.pdfIn PDF document text
    • https://jipotawa.weebly.com/uploads/1/3/6/0/136097183/dotedosugami.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/xjfMDnh/pase_elite_gratis_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/iUhigfu/african_short_hairstyles_for_ladies.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/176962874343bd9e.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/international_marketing_group_email_address.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/can_you_connect_ps4_gold_headset_to_phone.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/filelipuloboj_wujufafekasez.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/what_is_the_project_management_institute.pdfIn PDF document text
    • https://cdn.sqhk.co/noxuluni/VjcibMi/retro_coffee_machine_red.pdfIn PDF document text
    • https://biluvumilu.weebly.com/uploads/1/3/1/8/131860938/gupelaguwi.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/gghFieB/50807708474.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vubelifijam.atwebpages.com/jubefajikikalaxu.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/6441391711.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A52 5532 bytes
SHA-256: 27c0ed5786761dc9e514dbf69cf4f93f0f9f208a7f29fc98cfabae0c30aaaf54
font_01_sfnt_off00014d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0C 14508 bytes
SHA-256: 8495b331476dd2f39975d509b89ef6f386e889996380bcfc4c0d82e707c24d35
font_02_sfnt_off00017ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE3 16644 bytes
SHA-256: b92e15ed46007511071c3c18571ec76a3ff4b9f8c6a0ba946bb242f5271e5a95

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