Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b502641c75b518…

MALICIOUS

PDF

80.9 KB Created: 2021-04-02 01:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2891259a195352cb40cf12d7b44af6f SHA-1: d00a1ed00a60980ef64d0773440282c132f42b8e SHA-256: 29b502641c75b51867cff75997f6bf67c2fb1af5bc04a2449a2973cb9139d5a1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_LINK_FARM indicates a large number of links, and one specific URL, 'https://vilenefex.ru/strik?utm_term=abc+model+cbt+worksheet', is directly embedded. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=abc+model+cbt+worksheet
    • http://freefire-gifts.com/bhagavad_gita_quotes_in_hindi_downloadbm2zu.pdf
    • http://cashfree.store/fs_14_para_hilesi_apk_indirlip39.pdf
    • http://apelsins.space/sukewosopifuxosorivwfrs.pdf
    • https://cdn-cms.f-static.net/uploads/4401712/normal_6058bc90da3c0.pdf
    • https://serekarivevug.weebly.com/uploads/1/3/1/4/131407867/vujumatesogisup_sajirok.pdf
    • https://desebenenoda.weebly.com/uploads/1/3/5/3/135348916/lelanagenadat.pdf
    • https://cdn-cms.f-static.net/uploads/4368229/normal_60359d508fe50.pdf
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/f41d447.pdf
    • http://jakor.pro/fox_sports_world_series_announcersb1cz7.pdf
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fd058b0c420a.pdf
    • https://cdn-cms.f-static.net/uploads/4374860/normal_601726735c9f0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_8f509717b9934a9685bf9afd0208445e.pdf?index=true
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_7f1d72b4c1e34f869e740028c9c6cdc7.pdf?index=true
    • https://26577e91-18e8-42c3-8e85-49dcca1d6605.filesusr.com/ugd/195787_9fea41ebdcc04d48990324eabf5b6a02.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a6a308b-590a-42b6-89d5-3dd40992a02b/xomutojakon.pdf
    • https://uploads.strikinglycdn.com/files/82a255d1-3810-4975-8b92-86ea69c54f62/how_to_draw_a_cartoon_dragon_head_easy.pdf
    • https://beca70af-11ea-46d2-a649-d7fd44c468ee.filesusr.com/ugd/dd41e2_dea3eb528dd5408d9ca3df2f44394ce3.pdf?index=true
    • https://a001dc82-f31e-4944-9b76-0a8e602b6855.filesusr.com/ugd/e4ee87_e4d1e4ca84684358b627224c2c07e75c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/728a2c71-3213-4c10-8562-4ebdf39d01b6/86742815001.pdf
    • https://uploads.strikinglycdn.com/files/6b2bb18a-08c7-471b-baf1-2efe00ea1cc8/dodazovuxikomudapu.pdf
    • https://s3.amazonaws.com/jowutoneranemuk/student_brag_sheet_template.pdf
    • https://s3.amazonaws.com/jobavo/88064379762.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_off0000fd1b.bin
06a39aba913c0e40a6b085316d5fcf72b2ffd191476cdf10e376acbb7c6c13f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 5256 bytes
font_01_sfnt_off00010ee0.bin
d456650eec18ecabe2e7824a5f7da0ea43f60e037b7febf269f6d28d76f57f8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 11152 bytes

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