Malicious PDF — malware analysis report

Static analysis result for SHA-256 3759b39d2df267f6…

MALICIOUS

PDF

83.5 KB Created: 2021-03-18 08:18:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 774646a7ada8f84ee64426cfb1bdfc59 SHA-1: 21278c72762d3c446df398723573d745e9553a64 SHA-256: 3759b39d2df267f6c8ab51e6b47f25ed2dde1e632f31c3d55538713f22959b61
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically identified as a potential phishing or malware distribution point. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting malicious intent. The ML classifier and ClamAV detection strongly support the malicious verdict.

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://xezojetit.ru/strik?utm_term=resumen+trabajos+de+investigacion PDF link annotation
    • https://cdn.sqhk.co/jimevexir/aZoWJQ2/xopewobi.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/abhGRfQ/zofefotogifuj.pdfIn PDF document text
    • http://blaugrana.ru/how_long_study_for_dental_schoolf6gwo.pdfIn PDF document text
    • http://ighelpcenter.xyz/32783294394zxx4b.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/djhifie/34416847667.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/gcZigif/84875912083.pdfIn PDF document text
    • http://stnold.com/how_do_fossil_automatic_watches_workbrbzy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xoroniwogogo.rf.gd/formal_business_letter_format_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b2ecf69-a49f-4ed7-a931-c39c4d0e9d05/54867354593.pdfIn PDF document text
    • http://fibafewupo.epizy.com/free_printable_science_worksheets_magnets.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/76637719527.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/free_sample_tri_fold_brochure_template.pdfIn PDF document text
    • http://muxawij.rf.gd/karnofsky_scale_performance_status.pdfIn PDF document text
    • http://fokafupu.rf.gd/calibre_kindle_to_settings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/143a5aba-3a02-4208-8369-a66683bd8cd7/nawibixufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e5032b-33ff-4f5c-8f44-1b0a3e46e9ce/how_to_put_belt_on_bissell_powerforce_helix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bba2deff-7701-4944-ba68-f350adc21e02/68211301506.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a990c03f-73d3-456d-9cfa-7fe460019671/naval_letter_format_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14ed46b-58e3-41a1-b4b0-e5891c801ae1/the_power_of_love_celine_dion.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 5392 bytes
SHA-256: 36c0c4650c0c3b36282dc8d997b8f65b25c24fd1a850e6010eaed03e5041168b
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 13156 bytes
SHA-256: 3166afb7bc3d899dc5c0a684ed328576b72d4992a4cf382c4478d93513459922
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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