Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c3bd4e3436226b…

MALICIOUS

PDF

80.7 KB Created: 2021-05-03 05:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d89b5b1191d48885455b09366998439b SHA-1: ed1d830677ab6a23f4e827be7aaf5c85c0da2862 SHA-256: 25c3bd4e3436226b6f6524b96fc68467ff282efe8d58ac6a4536ba3d4175c9bf
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, specifically using a 'Browser extension / update installation lure' to trick users into downloading potentially malicious software. The presence of a large number of external links, many pointing to disposable hosting, further supports a malicious intent to redirect users to harmful sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=free+download+jdk+8+for+windows+10+64+bit+filehippo PDF link annotation
    • https://cdn.sqhk.co/kepozote/eSAYDhh/81603211987.pdfIn PDF document text
    • https://gunowiwusofemu.weebly.com/uploads/1/3/4/7/134705227/buzemawup.pdfIn PDF document text
    • http://keribek.22web.org/bluestacks_filehippo_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/LUeLIhh/xajukudisekunixaserutin.pdfIn PDF document text
    • https://cdn.sqhk.co/fusajovogi/ifxhugj/fufevamuwudajow.pdfIn PDF document text
    • https://kuvitoguke.weebly.com/uploads/1/3/0/8/130813837/fixivapixixor.pdfIn PDF document text
    • https://cdn.sqhk.co/duxisabaza/dhirivn/pixelmon_mod_download_tlauncher.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/7jaK8dm/96712092347.pdfIn PDF document text
    • https://perepori.weebly.com/uploads/1/3/4/0/134016710/vuxuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5ff77a7bec4e5.pdfIn PDF document text
    • https://cdn.sqhk.co/mivuxakadu/hgDgjEt/lubukudo.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/WhhjcX9/33088358537.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_6002ac52d41da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://178fd8f3-986e-459b-a431-83c1f58eadb8.filesusr.com/ugd/7a8e82_246464ef2a6343f08b6ca6831f35914d.pdf?index=trueIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_104a1821c81643e9861c31e669670a6d.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_a6d34195a6404dc7852cf7addc9d9e81.pdf?index=trueIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_fa854529f733424fa70254372a30f93d.pdf?index=trueIn PDF document text
    • https://30dce114-5b7d-4ba4-aa44-e083516804ec.filesusr.com/ugd/7de0fd_cd7ad4da6e0f43719ba7fa9b0929da8e.pdf?index=trueIn PDF document text
    • http://ludujefu.epizy.com/good_morning_in_italian_informal.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 5872 bytes
SHA-256: 105736e2cec01a4f36958e5185655f27d8da751ad324c20dd5e0becb7a4b6e41
font_01_sfnt_off000100ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EE 10664 bytes
SHA-256: 02a735ddf2ff08be8006028ca99f84e4cdbe9616ec3c5cbec5bf216a4d2779a0
font_02_sfnt_off0001256b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1256B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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