Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8015bc81578d4d3…

MALICIOUS

PDF

79.9 KB Created: 2021-03-21 06:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7a5df6f1e285b76b87c2d3941b52c86 SHA-1: eb742719d78f20b949afeaab2e0c334d99944ef4 SHA-256: f8015bc81578d4d33322c64b2e5913e678febe553ca5945d344445f41ea359fe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting the document's purpose is to redirect users to these potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/wix?keyword=beth+thomas+now+2020
    • https://sewetinupas.weebly.com/uploads/1/3/3/9/133997680/rufus.pdf
    • http://antonioita.fun/hamilton_beach_stay_or_go_crock_pot_instructions1i6sv.pdf
    • http://yoga-fitness.space/accounting_principles_11th_editionjj9ng.pdf
    • https://nelejejo.weebly.com/uploads/1/3/4/8/134883178/kekezulegi-radenevuliju-tuvasubebofo.pdf
    • http://health-top.ru/modisikuloxubeguzurid35t2.pdf
    • http://werenntaq.online/cam_icu_flowsheet_deutschghnaq.pdf
    • http://straponartist.com/goboxiripafase5jhy7.pdf
    • http://bluetea.space/sojikivuziparijunedrdyt4.pdf
    • http://temppicture.xyz/vba_excel_2020omckk.pdf
    • http://lifegirls.site/fire_alarm_system_troubleshooting_guidew5hzy.pdf
    • http://vewikimeno.22web.org/87040937378.pdf
    • http://trokot-online.xyz/arithmetic_progression_questions_and_answers_class_10i1b4n.pdf
    • https://pipudanino.weebly.com/uploads/1/3/4/7/134708560/989760.pdf
    • https://zuberexuwaxif.weebly.com/uploads/1/3/4/5/134501439/740857.pdf
    • https://dufavepuxafolim.weebly.com/uploads/1/3/4/2/134266173/8211457.pdf
    • http://pamuxixa.iblogger.org/burmese_english_picture_dictionary.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/falevi/bosu_ball_workout.pdf
    • https://033f1a72-e514-447f-b44b-9d234b37386c.filesusr.com/ugd/f05202_138053990dd24b1aaedbc281f34d0d41.pdf?index=true
    • http://devonefon.epizy.com/gewapumewizivazov.pdf
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_3446ace35d2d4fdbbfa922edbbbbf7df.pdf?index=true
    • https://a581e706-3bf6-41fb-8978-ad4d4077590d.filesusr.com/ugd/afbe6b_ce743e871890445b95cabccc564bf544.pdf?index=true
    • https://s3.amazonaws.com/tamobalasu/how_to_write_an_introduction_letter_about_yourself_for_a_job.pdf
    • http://sejofedavija.epizy.com/beganegepat.pdf
    • https://s3.amazonaws.com/mujesogi/vmware_vsphere_client_5._5_windows_10.pdf
    • https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_b5f95aa05d1543b4be93b63c336f5dad.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7a.bin
ea5bcec5e1b347d2d152b68d85c06fbf1eb6f7f86c57774aeab19788167663ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 5212 bytes
font_01_sfnt_off00010c22.bin
837749f018cd4ab63ab71ab3248b09345954cd201945be3714304c3321d90f54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10588 bytes

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