Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b28f2e50521f7d6…

MALICIOUS

PDF

79.4 KB Created: 2021-05-19 16:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 4d316df488b617c990dd56399367d33b SHA-1: 21e1d630219df7ce1dafbbba58b064def3387e32 SHA-256: 3b28f2e50521f7d6a9d88615d115a700d6bba922f2775f223c456726e4ff19d4
96 Risk Score

Malware Insights

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

The PDF file contains a URL that, when visited, likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to writing a letter of recommendation, which is a common pretext for phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+write+a+personal+letter+of+recommendation PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404740/normal_5fecae3b737fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_60136b6928e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376354/normal_6043053b3abc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470405/normal_605682a9c91cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444875/normal_60522b8f6c330.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/baxunaf/commercial_cookie_cooling_racks.pdfIn PDF document text
    • https://s3.amazonaws.com/lurutopobi/nolafurekozozo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4486e51-6fc8-4b76-a2b5-8a088887251b/how_to_repair_win_7_with_command_prompt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/789ae295-ee15-49c5-bbbc-cddcba524a4c/program_x1_remote_to_emerson_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b0a87fa-1cfe-4823-9564-905fb9d03598/kabipelasosulomusizut.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/29950113367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3048b439-dfc8-4467-b840-27b119092a47/xanotunatefegiviveju.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/cinema_4d_r18_plugins_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c46f9b0-a5e1-4f9f-81ea-8d916ede7bb9/29140409465.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/strawberry_banana_and_blueberry_smoothie_recipe_with_almond_milk.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/comrade_in_america_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391c03c2-0bf8-4986-ab79-82eb346d449f/26865581989.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/65227699554.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/78455832022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/559d16b4-37c7-422e-a149-d21e0fed3ae0/el_poder_de_la_oracion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24ff49b3-4dbd-4db0-9adb-c6ed77041cb3/92024871807.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_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5356 bytes
SHA-256: 5b659c8ad37bfda546f79aa2c4301f0b110160eccdd69959032e8b04c70469dd
font_01_sfnt_off00010c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C05 10400 bytes
SHA-256: 15d3a6f89a36f775741ca5cf80e380e9669fce77b144c38014e3537860ac3341

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