Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8d5cdc4a459c23…

MALICIOUS

PDF

72.1 KB Created: 2021-03-27 22:22:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 1c4b91b20647923ee26759dffe0d57cc SHA-1: d43700f827d73bbad2c9a90a2b219db246b9c0a7 SHA-256: cf8d5cdc4a459c23d0556b4d14fb19166aadf7405658ff79ff14d0e98a7bfbe3
124 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, with several pointing to disposable domains and one specifically flagged as a link farm. ClamAV detected this as a phishing trojan. While no scripts were extracted, the presence of many suspicious URLs suggests a phishing or malicious content delivery attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8215

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
  • 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
  • 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://fokemale.ru/award?keyword=verbos+impersonales+ejercicios+pdf PDF link annotation
    • http://venupalu.iblogger.org/implicit_instantiation_of_undefined_template.pdfIn PDF document text
    • http://tublitalia.fun/zobiwopogikaxokevipuv3kbt.pdfIn PDF document text
    • http://hushseo.online/5081563337s41iz.pdfIn PDF document text
    • http://nasolanamisajo.iblogger.org/retro_commodore_64_games_list.pdfIn PDF document text
    • http://fopasezexelori.iblogger.org/87369722648.pdfIn PDF document text
    • http://shtampshop.ru/80644067641plr1k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b448d532-9026-4e1e-9000-bdbeb39753d4/snugride_snuglock_30_base.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/word_cookies_peach_10_level_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064f71b3-4a2b-4430-a195-bc2d7d961cf3/5741438550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e53f3b6-64ad-4a66-9a4d-250d512a3354/tabla_de_equivalencia_de_unidades_del_sistema_ingles.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/kasigozojijogekuzezovip.pdfIn PDF document text
    • http://fubolorira.epizy.com/batson_v_kentucky.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/78496576429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e81bfda3-6855-4284-837b-8b46ab289c2d/heroes_gods_and_monsters_of_the_greek_myths_free_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48b23621-8d94-4318-9e6d-f7aec5a858ae/the_collected_essays_journalism_and_letters_of_george_orwell_volume_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f81a4037-0ec6-48c1-add9-10e1a1037824/ap_world_history_dbq_rubric_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e01e970-8f49-47af-9960-5dc9288900b7/219270592.pdfIn PDF document text
    • http://masomoxesezog.rf.gd/cascade_dafo_3_order_form.pdfIn PDF document text
    • http://luviwozota.rf.gd/nanelanarudi.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 5480 bytes
SHA-256: 5f7660e323bb5c2885d99be425d35121698f5ddc1904ad20fe02f615a8e4ec6a

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