Malicious PDF — malware analysis report

Static analysis result for SHA-256 774d9030f815cccd…

MALICIOUS

PDF

79.4 KB Created: 2021-03-20 01:31:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e4df9316b52271224830a5e9c2deb14 SHA-1: 346134641c9bd1a70cb5c57ec98b3df9a1f343fd SHA-256: 774d9030f815cccdbcfd69b58a470d804904e06b7f3f0cb6bc0857870fbbd469
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, suggesting a link farm or redirection scheme. ClamAV detection and ML classification confirm its malicious nature. The embedded URLs are likely used to distribute further malware or conduct phishing attacks.

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://botokaw.ru/award?keyword=b.+ed+entrance+syllabus+odisha+pdf
    • http://legendnat.space/bojivolomixixote4zco1.pdf
    • https://ralubimuxafoku.weebly.com/uploads/1/3/4/3/134373731/7887742.pdf
    • https://lijiwowotu.weebly.com/uploads/1/3/4/5/134587055/kadawapelo_vevajiruw.pdf
    • http://tadugebakonuged.getenjoyment.net/c_primer_6th_edition.pdf
    • https://cdn.sqhk.co/baresupujar/B4ib9gh/legends_of_runeterra_cards_art.pdf
    • http://kumululurug.scienceontheweb.net/pafor.pdf
    • https://sipavokipepino.weebly.com/uploads/1/3/4/3/134330850/080fe765f0aff.pdf
    • https://jivikusobule.weebly.com/uploads/1/3/5/3/135326696/846042.pdf
    • http://eushopvmn.site/kivedanyx1oa.pdf
    • http://ing-jobs-opportunities.com/9717989972q1flc.pdf
    • http://vojakebuniseti.22web.org/wokukibojebepopigabe.pdf
    • http://gakmancreatures.ru/technical_analysis_ideal_for_beginnersx1r4z.pdf
    • http://kalanuso.iblogger.org/jaleserajonize.pdf
    • http://fullcreditreport.info/15892455507nwfd6.pdf
    • https://lokejarezuwomi.weebly.com/uploads/1/3/0/7/130776656/refozasaniz_besemobuduwudu_bibadekanawepen.pdf
    • https://cdn.sqhk.co/dutaxato/fMMOgOq/whatsapp_messenger_software_for_laptop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gefifeji.rf.gd/nusemaxamujodo.pdf
    • https://6c8027e1-9878-41b3-a9ef-32ba2b6bcd02.filesusr.com/ugd/185811_760b0a6ec6a04791be76407f053edb40.pdf?index=true
    • http://kesitebogi.epizy.com/79425977223.pdf
    • http://dovitunazimaze.epizy.com/airdrop_for_windows_7.pdf
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_82208920626c489caba0d8de1f74de1a.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_off0000f808.bin
5690c3b027e9b019d0d7272e3d16594fc12b2b4c814fd3bc9a4c4b6770b5358a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 5568 bytes
font_01_sfnt_off00010af9.bin
b3688d500082e166d290a6e0dc3881a9812a77ad223a250298e4c619c6c5ba97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF9 10464 bytes

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