Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf437ef4c1e35b3b…

MALICIOUS

PDF

74.3 KB Created: 2021-03-02 20:31:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 0230593dc9caf17f15fffbe340859d18 SHA-1: 84f534226d0fbf6ca292d357de516bbf60b8d1dc SHA-256: cf437ef4c1e35b3b36ded6d31cf8e6e1ec3af2937a5c9181fecd08a8e410fd0b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The embedded URLs suggest an attempt to direct users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/123?utm_term=what+is+the+theme+statement+of+the+cask+of+amontillado PDF link annotation
    • http://vexeteseta.22web.org/38786933584.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/sewepuxaseno.pdfIn PDF document text
    • https://kovunigok.weebly.com/uploads/1/3/5/3/135317038/bubimopalifapod.pdfIn PDF document text
    • https://kedixusivazusug.weebly.com/uploads/1/3/4/8/134869684/savilexa-mosulezoboroluz-goxulozel-pukovisa.pdfIn PDF document text
    • https://wobofosowipifir.weebly.com/uploads/1/3/0/7/130776138/5465049.pdfIn PDF document text
    • http://idealica-italiaufficiale.website/sijijkj5va.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/98b83b4e230bbe.pdfIn PDF document text
    • http://alfa-quest.ru/30124878278boe39.pdfIn PDF document text
    • http://erethiztzj.space/rsos_admission_form4fljf.pdfIn PDF document text
    • http://frankiearvelo.com/66884137113s89rs.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/werikope.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/jurit.pdfIn PDF document text
    • http://ekzo-fruit.ru/delhi_belly_movie_ringtones_free4ysr0.pdfIn PDF document text
    • http://help-bluebadgecenter.com/95500355414efh1f.pdfIn PDF document text
    • https://satuvimafinob.weebly.com/uploads/1/3/0/7/130739393/779727e6441fde5.pdfIn PDF document text
    • https://vawuzusafut.weebly.com/uploads/1/3/4/8/134863851/jututodas.pdfIn PDF document text
    • http://kigowamukidiba.iblogger.org/howard_leight_impact_sport_earmuffs_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dugupafado.epizy.com/28151764477.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/cape_minecraft_pe.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/36966836733.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/95197341708.pdfIn PDF document text
    • http://dowexibagodi.epizy.com/blockchain_technology_research_paper.pdfIn PDF document text
    • https://s3.amazonaws.com/mulerux/datezopipeli.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_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 5240 bytes
SHA-256: ac96e0e3b8332e6c1d4bdbe5c729e874e0a2c30f4c3e0f532bcc13f19dd8e423
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 10884 bytes
SHA-256: 97f72da4ac9a812d2266c9c46399abaeecf97ca8333834518c589e85078825fe

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