Malicious PDF — malware analysis report

Static analysis result for SHA-256 d580a1ba4c05f192…

MALICIOUS

PDF

77.0 KB Created: 2021-05-09 22:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e3d42764d1903ba28888bdc15ce35ac1 SHA-1: 502cde39af834d7a82fd0738c69c29a631fbc565 SHA-256: d580a1ba4c05f192bec2bd168b48bf8d0614b9631e8100a464fb22766cdaf23f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URI that redirects to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to be a lure related to musical instruction, likely intended to trick users into visiting the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=how+to+play+choir+warm+ups+on+the+piano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419235/normal_6013349d1a07c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418584/normal_60027544dfff1.pdfIn PDF document text
    • https://cdn.sqhk.co/romumoxoleno/HNhhhcg/math_calculator_solver_with_steps.pdfIn PDF document text
    • http://fijazubelanulek.mywebcommunity.org/variety_rice_recipes_in_tamil.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/cause_and_effect_reasoning_tricks.pdfIn PDF document text
    • http://chtotakoebezuz.biz/readings_in_classical_chinese_philosophy_second_editionagwa3.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/MSYgehe/maplestory_reboot_master_craftsman_cube.pdfIn PDF document text
    • http://bokaxakoz.sportsontheweb.net/encephalite_post_infectieuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477910/normal_600858eaabeab.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/ufgdM6p/java._lang._outofmemoryerror_java_heap_space_in_tomcat.pdfIn PDF document text
    • http://prodson.space/96541385321855r7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421624/normal_5fdc4f4635257.pdfIn PDF document text
    • http://betmoy56.com/inverse_fourier_sine_transform_of_e-ax_xkff1t.pdfIn PDF document text
    • https://cdn.sqhk.co/jiledexuda/Uk4Nqjh/dueling_banjos_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_6052b98e61e17.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/pululusodogi/pogususomoxamor.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/gefiwijele.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/mojofatexafaserigokuje.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/abide_forms_of_verb.pdfIn PDF document text
    • http://rogofideb.onlinewebshop.net/kowufoxudumufezavaku.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/90810946078.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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 5328 bytes
SHA-256: 1b98e8a0dfb4f8f800f2ab465c3a8424b6e39b824a76183e768e9069d4eee3b6
font_01_sfnt_off000100b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B7 11048 bytes
SHA-256: 8852708434ca44c7ddd0a437656dd5280b0e31754b6b4b6047b2b9281a083524

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