Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd4dcb9eb1576ee…

MALICIOUS

PDF

75.4 KB Created: 2021-03-15 03:10:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 66b0f8662d2dd91edbd5a9f119663f27 SHA-1: 121a249416491feb2e8c2fc3721fda650bb85bba SHA-256: ccd4dcb9eb1576ee4c4d8c2c4722799d07d365a02147eeea959505978230c527
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 0.9991

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=how+to+learn+english+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414688/normal_5fdaf38dd01a5.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/2ELYwUx/3514568644.pdfIn PDF document text
    • https://dujaporugegebo.weebly.com/uploads/1/3/4/3/134314108/wikavakafufafemaligu.pdfIn PDF document text
    • http://heymama.store/wasokiwusukeo1.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/28691088c5.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/MUgjdPT/monster_hunter_world_companion_gadget_rotten_vale.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/F1hdeQc/kuvuxedutol.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/jiymhe8/devejeronuvor.pdfIn PDF document text
    • https://cdn.sqhk.co/laripikiwafo/gAUw7Ca/football_scores_today_live_scores_sky_sports.pdfIn PDF document text
    • https://xirovule.weebly.com/uploads/1/3/4/7/134749068/7b1a0b10d85ba.pdfIn PDF document text
    • http://teenagetutor.online/7789961356jql3e.pdfIn PDF document text
    • https://ribuborufexegax.weebly.com/uploads/1/3/4/5/134507127/3628923.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/lie3Ihi/jolted_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/leburogutu/jfiiZ13/graphic_design_portfolio_template_indesign.pdfIn PDF document text
    • https://bikuxemigoveju.weebly.com/uploads/1/3/4/3/134373773/tipipesamiwefamerij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492880/normal_600faa68a6fc4.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/2063637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fd0e702c59eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_60052ac75959d.pdfIn PDF document text
    • https://kiwaluraxipexe.weebly.com/uploads/1/3/5/3/135326690/1568590.pdfIn PDF document text
    • https://mugibamarenov.weebly.com/uploads/1/3/4/1/134109107/gegikipepepizajex.pdfIn PDF document text
    • https://galezarulunozip.weebly.com/uploads/1/3/4/8/134896955/ridize_wonasaridelun_sufalezek.pdfIn PDF document text
    • https://sumokexopusoval.weebly.com/uploads/1/3/1/3/131378975/niwatetikobidezat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378620/normal_5fe0d1344096f.pdfIn PDF document text
    • https://cdn.sqhk.co/jekunesoru/jjK7gdY/free_window_10_activator_setup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE93E 5220 bytes
SHA-256: 8edabf52472885f91ecdbd6fcde48dae5965fffccaf0c09feca1254ab99cb019
font_01_sfnt_off0000fb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0D 10952 bytes
SHA-256: 84e7458cce5b3b0efcfdc1c64e1b053209939d93da0f5d04de5865837be14c76