Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dd9f0958d736da…

MALICIOUS

PDF

68.7 KB Created: 2021-03-27 16:54:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 69a84be4fb3c0784fff46d88b6277261 SHA-1: 3c9af0ccf9ad5487fbbe77191d50ce8ae11b3f11 SHA-256: 41dd9f0958d736dad9f4d327f7372388566c99148247918d565a77bef6523244
126 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to contain keywords related to "Carmina Burana" and PDF score, likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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://botokaw.ru/award?keyword=carmina+burana+orchestral+score+pdf PDF link annotation
    • http://gufosizikok.22web.org/articulate_storyline_3_free_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499299/normal_5fdd299128521.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/game_of_thrones_episode_recap_season_3pagzv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409092/normal_5fe05d4ed0fcc.pdfIn PDF document text
    • http://portkamesto.site/watch_hd_movies_online_free_streaming_bollywoodyf4sd.pdfIn PDF document text
    • http://dovazevenujo.22web.org/alphabet_in_spanish_language.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_605bb7b6d22d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423431/normal_6021d13ca032f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378160/normal_5ff4a8f685625.pdfIn PDF document text
    • http://priz24.site/hamartia_in_hamletnbb29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_604f845327100.pdfIn PDF document text
    • http://randname.ru/75437620854s4ipj.pdfIn PDF document text
    • http://pedron.fun/eating_animals_jonathan_safran_foer_audiobook0iv8b.pdfIn PDF document text
    • http://arendagg.xyz/ddda_mystic_knight_guidei65pt.pdfIn PDF document text
    • http://shoop-ft.ru/sheep_classing_definitionq6zx0.pdfIn PDF document text
    • http://krepezh.guru/automatic_tap_auto_clicker_pro_version_apks0txr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_5fe4aaa19f6b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://talidarufuji.epizy.com/31072280511.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/musica_clasica_para_guitarra_electrica.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/76700758784.pdfIn PDF document text
    • http://sozidimimu.rf.gd/tenejimiwuzifip.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_off0000cf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF14 5440 bytes
SHA-256: 1c6f6cad63f464be6d73d8aba0f07c1eed1509cf33a09b74e65e2d4e87796edf
font_01_sfnt_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 10600 bytes
SHA-256: 8e9056b4bd45569ffcf7ad5d6f38eb21294dd3613f11d02cc4621f6b2bdbf8e1

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