Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca9ecf0bede64e40…

MALICIOUS

PDF

91.0 KB Created: 2021-04-13 21:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55904d296b7ed92b1374cdda11d59b92 SHA-1: 5d4500c62ed7b8a39fe464e7591d8ea90d446e49 SHA-256: ca9ecf0bede64e4024fa3193cf85a982b8cc3054c3c3a51f864162b4a3b58323
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically appearing as a search result for a technical document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and a large number of external links suggests the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=pharmacy+calculations+for+technicians+5th+edition+answer+key
    • http://lupazul.mywebcommunity.org/road_map_united_states.pdf
    • http://tadajixilatu.scienceontheweb.net/cctv_camera_price_list.pdf
    • https://jejavogizapivi.weebly.com/uploads/1/3/5/3/135388932/d37e1.pdf
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/xefex.pdf
    • http://faxusupovetek.sportsontheweb.net/gifuriruwewodepog.pdf
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/divedunofotuzem.pdf
    • https://vojidejera.weebly.com/uploads/1/3/2/6/132695434/zemunapusezi.pdf
    • https://gixakipero.weebly.com/uploads/1/3/1/4/131412713/fululirivaxavager.pdf
    • http://gafabotipunofu.mywebcommunity.org/73579575399.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jotogorurekuro/amazon_alexa_app_android_tv.pdf
    • https://s3.amazonaws.com/dinilederu/gemuzozefax.pdf
    • https://s3.amazonaws.com/bulujono/rumupagomivem.pdf
    • https://s3.amazonaws.com/fibesezati/what_to_consider_when_buying_new_construction.pdf
    • https://s3.amazonaws.com/bipepezuwed/82235076562.pdf
    • https://s3.amazonaws.com/lewuli/zuvarabevogaxobavefula.pdf
    • https://s3.amazonaws.com/damerirazib/32687135515.pdf
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_9b523e5c4ba247e188795cd9da02d7c7.pdf?index=true
    • https://s3.amazonaws.com/lolaritemukole/a._m_n_p._m_full_form.pdf
    • https://a96990da-dd17-4b11-844c-aba2d588d1b6.filesusr.com/ugd/5e5e7b_2d18418f35454e87814dcd6fc460c073.pdf?index=true
    • https://s3.amazonaws.com/jiwisigetizoxif/harry_potter_gobstones_answers.pdf
    • https://s3.amazonaws.com/tubukeganuji/spurs_vs_wizards_injury_report.pdf
    • https://s3.amazonaws.com/defipedibe/biniwevan.pdf
    • https://s3.amazonaws.com/savukojubusum/salesforce_crm_interview_questions_and_answers.pdf
    • https://c6506652-bf5e-4f52-be36-03dbfaede22c.filesusr.com/ugd/f74919_4593387f4da240009da84917bc0d261e.pdf?index=true
    • https://s3.amazonaws.com/jagux/assoluto_mod_apk_1._28._3.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012342.bin
fdc04a5d1122bd2885eaff920d9be08acab48cdaeb07ec74018495fcfda06329		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 5644 bytes
font_01_sfnt_off00013666.bin
2eb67091c83dc98dc0c9d60993cf01428a90294e474ca99edb37c2410f5a5c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13666 11596 bytes

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