Malicious PDF — malware analysis report

Static analysis result for SHA-256 396ba85ae1fd90cb…

MALICIOUS

PDF

84.0 KB Created: 2021-04-10 06:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 770b6f07d6887792aac8c017e8a20102 SHA-1: 96f0d3c5fa34462f2156bf936ab0026a39e2c22c SHA-256: 396ba85ae1fd90cbd4504d442ef03513438bfacf72eee1410a8a9ac7cb1a7274
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a malicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to be a lure related to the binomial theorem, suggesting a phishing or social engineering attempt. No scripts were extracted, but the presence of a malicious URL and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=what+is+meant+by+binomial+theorem
    • http://xosubowavenu.mypressonline.com/jeruxadilarir.pdf
    • http://fumumowovufa.mywebcommunity.org/google_docs_to_word_converter_online.pdf
    • http://pinipuvazus.22web.org/voditovinolazinu.pdf
    • http://xitawefavam.medianewsonline.com/bezupamurimitinewotuxab.pdf
    • http://xuwuvewisin.mypressonline.com/shark_duoclean_powered_lift-away_speed_vacuum_filter.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e564ead7-16df-49a9-b1ad-800775cd7325/que_tipos_de_sistemas_economicos_existen_y_como_se_distinguen.pdf
    • https://uploads.strikinglycdn.com/files/2ebf022c-69ab-4992-86a8-c450eb1ea5ca/nepapugozalojitekuwumup.pdf
    • https://s3.amazonaws.com/kukazowox/ibps_clerk_call_letter_2019.pdf
    • https://s3.amazonaws.com/sutawowirosuvuv/text_response_essay_introduction_sample.pdf
    • http://kivozusemu.atwebpages.com/nordic_track_exp_1000s.pdf
    • http://sefowolo.atwebpages.com/sidiloripisejibivikixu.pdf
    • https://uploads.strikinglycdn.com/files/de85a76c-cb2a-4c77-9a91-57888253e798/social_media_as_a_marketing_tool_research_paper.pdf
    • http://pekiluji.atwebpages.com/53270701821.pdf
    • https://uploads.strikinglycdn.com/files/9580df4f-21fe-4ac9-81dd-6bd19c6c2199/40662714660.pdf
    • http://pibuluxe.rf.gd/54457966405.pdf
    • https://s3.amazonaws.com/redegelesibif/zokenujujoligupesefe.pdf
    • https://uploads.strikinglycdn.com/files/71177d00-94d0-45b5-9e87-c5a51abec32c/cost_of_washer_repair.pdf
    • https://s3.amazonaws.com/sirilagewuga/somewhere_over_the_rainbow_ukulele_chords_eva_cassidy.pdf
    • http://xutenujute.myartsonline.com/vojolasuvujipukobuviwupir.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f330.bin
9565893189c9ba75d0e6cbf3170203cfa55376c5a981c09a9737f67ea6f4cf13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF330 5180 bytes
font_01_sfnt_off000104b4.bin
2e73c4e22bd410370f23f31557021ed30a10c1cbbcb0325caaa45b1316e1d21f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104B4 11388 bytes
font_02_sfnt_off00012c04.bin
7f6586161f7b9a22f4f0ddce7d814dd0a5a61508991d12f7c8c68c247f62cfbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C04 16124 bytes

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