Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cf38ab2e54c61a…

MALICIOUS

PDF

77.1 KB Created: 2021-02-28 08:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f6ab752f67daca4281a03d2819bfa9a5 SHA-1: cb064a34f74cd08eff35fd4dbe1088627a90fb6f SHA-256: c9cf38ab2e54c61af023cdc7341f374bbae02b0e360b3a23de2b080ee0239c33
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to suspicious or unknown domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the conclusion that this PDF is part of a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=navy+seal+full+movies+2020 PDF link annotation
    • http://websporizle4.com/tabimasavetuminafuga4tgnk.pdfIn PDF document text
    • http://canonsburglake.org/kuta_software_parallel_lines_and_transversals_worksheetgy0mp.pdfIn PDF document text
    • http://dvestideyli.xyz/throne_of_glassb4md1.pdfIn PDF document text
    • http://clebohets.xyz/farming_simulator_14_mobile_guide0xfxp.pdfIn PDF document text
    • http://bitcoins-profits.com/macbeth_act_1_noteskjwte.pdfIn PDF document text
    • http://notdull-eng.online/autentico_2_core_practice_answers_page_64d8m70.pdfIn PDF document text
    • http://reduslimitaly-official.website/vofofemibapenosajubuthnq5.pdfIn PDF document text
    • http://rivozuzeno.mywebcommunity.org/teacher_created_resources.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puwoxigawezab.epizy.com/tipos_de_funciones_inyectiva_sobreyectiva_biyectiva_ejemplos.pdfIn PDF document text
    • http://fekajot.rf.gd/comprehension_questions_and_answers_for_grade_8.pdfIn PDF document text
    • http://jimavuzeladones.epizy.com/caplinger_mills_fishing_report.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/unqualified_audit_opinion_report.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_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 5220 bytes
SHA-256: 93168bb8abdad82e6f98d44f8163be4d01ebae034776598770fe2a40c1bb74a4
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 11112 bytes
SHA-256: c82185c6739edb6b1ea6531beea265db5efbb99d693e0406bbf2dc7d3da07595

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