Malicious PDF — malware analysis report

Static analysis result for SHA-256 3844e982b616e9b8…

MALICIOUS

PDF

73.4 KB Created: 2021-02-19 16:44:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5b3c9101cdfc2a4e20087273ed853b0f SHA-1: 7d2ebf5d5d2de913b575e27d6c302fbf745ea13e SHA-256: 3844e982b616e9b89d54806f1b7c454643afd5e8b8d43ab3443c41c01b0402cc
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'John Deere 950m', likely a lure to entice users to click the embedded links.

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=john+deere+950m PDF link annotation
    • http://moreprodukti.com/tecplot_data_file_formatyxjg2.pdfIn PDF document text
    • http://mestorating.ru/my_hero_academia_episode_8_google_doo2hcq.pdfIn PDF document text
    • http://voiprormul.xyz/la_sabiduria_de_las_emociones4t5r0.pdfIn PDF document text
    • http://muzhskoizhurnal.ru/goons._io_knight_warriors_unblockedup7g6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367687/normal_602bb0fc19ec8.pdfIn PDF document text
    • http://fresh-ita.space/zudosktwoa.pdfIn PDF document text
    • https://cdn.sqhk.co/gemadaruvow/5sijX1V/card_thief_upgrade_guide.pdfIn PDF document text
    • http://tronreserve.online/discombobulate_sheet_music_piano07fe3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404990/normal_6008f69f861db.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/LRihRic/light_up_deer_family.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/25503775454.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/14060382693.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/antique_olive_normal_font_free.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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 5056 bytes
SHA-256: 91ab6d4b5e1e4d5183931fc3ec683fd4d6acbfec0f00ad3c796f70df2478cdcc
font_01_sfnt_off0000f3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DF 10860 bytes
SHA-256: 639fa9f23eeb42b489d69c41546e7d45875f16ae595c565eef3dd071387fbe2d

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