Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f2953188db6743…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 05:43:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5d82ab91eafb431ebcbd62d2fc27b40 SHA-1: 77dd0e34f894cbecaf89195c257578def8cc04b1 SHA-256: 21f2953188db6743c62fe264363ea6a24ec41c31f0f69eb650102ee1c310ea8d
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable hosting, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the nature of these links, suggesting a deliberate attempt to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://druttle.ru/strik?utm_term=bf+open+box+price
    • http://brumbum6.xyz/20168470861cli9b.pdf
    • http://cozyplacefor.rest/gogowhz2xu.pdf
    • http://liketime.online/vixaviguxos6l089.pdf
    • https://cdn.sqhk.co/xawefigi/ijiiCjA/playground_near_me_with_swings.pdf
    • http://tomokatixo.mygamesonline.org/how_to_transfer_character_ff14.pdf
    • http://scm03.ru/best_online_project_management_training40ets.pdf
    • http://getcreditreport.info/74504185358yxhmw.pdf
    • https://cdn.sqhk.co/bavimimo/jKZUtji/civil_war_battlefields_in_west_tennessee.pdf
    • http://soldonlakewood.com/formula_para_volumen_de_prisma_octagonale1dso.pdf
    • http://prizinsta24.site/reading_comprehension_tests_fifth_grade3wllu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://neketepa.myartsonline.com/23203750230.pdf
    • http://jajogagek.atwebpages.com/building_electrical_design_guide.pdf
    • https://uploads.strikinglycdn.com/files/d60ea87d-425a-4101-b1b9-5950ef07e0fa/febamemubav.pdf
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_727ebceb2d144d9d9f36f8fa7eb90e2d.pdf?index=true
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_e015f30400134713bc6f3b8ad844667d.pdf?index=true
    • https://1c54689f-8f60-44d8-8d81-b144d6ea8ada.filesusr.com/ugd/787b0a_a655786a25ee4606bbbbebe1afaf0758.pdf?index=true
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_46ba70ca5df948ceaac0d27aed689e11.pdf?index=true
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_eb7113594d2e43eea7f8a250ee1d155b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/289ee64b-4424-477b-92cb-37f3a9fbbc8e/mefezisufutujegipujizujo.pdf
    • https://uploads.strikinglycdn.com/files/35ffd348-ddbf-4d76-a195-4808360aa731/sound_blaster_audigy_2_zs_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8de.bin
50ddb55e2770a29d3c9e5d2d2e86fbfcfddd1bdbc55c55e5f31bfc25adc60776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 4848 bytes
font_01_sfnt_off0000f976.bin
9c50f327575dbb91bc24072b22b32d4d992f446659bfdb232fb2445e8b931550		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 11192 bytes

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