Malicious PDF — malware analysis report

Static analysis result for SHA-256 949e528e0aa87862…

MALICIOUS

PDF

77.4 KB Created: 2022-06-14 00:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2022-07-15
MD5: 035e1f78dab3d7e3189d37dbde4b5c50 SHA-1: be211fe9bd923a607d9a8b2435d0d47da098770f SHA-256: 949e528e0aa8786279c35a7af7207e0b42b5468faae1a67a5bc79ccd71a98c5d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded JavaScript and a significant number of external links, many of which point to PDF files hosted on file-sharing services. This pattern is indicative of a link farm or phishing campaign designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ragaz.co.za/YmrXLWy8?keyword=mixed%20tenses%20exercises%20with%20answers%20pdf%20free%20pdf%20download%20without
    • https://vojolumawagu.weebly.com/uploads/1/4/1/5/141508938/levorimiwute-vobemuxikunote.pdf
    • https://philippebensac.com/upload/files/328400026.pdf
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/vilemadefanetumum.pdf
    • https://mivewuwadomabat.weebly.com/uploads/1/3/1/6/131606259/xokijolumoruger.pdf
    • https://lesevuka.weebly.com/uploads/1/4/1/4/141445089/da646b00d1.pdf
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/e15fd798ba228e.pdf
    • https://xifamiwi.weebly.com/uploads/1/4/1/2/141256171/xunaxikadufo_devedexuxumesul_mepufakiben_zexapewelodixef.pdf
    • https://rotufufuzefido.weebly.com/uploads/1/3/4/9/134901673/6740819.pdf
    • https://www.ajmetaldesign.sk/gfx/administration/js/ckeditor/kcfinder/upload/files/30048580385.pdf
    • https://biwefixosepow.weebly.com/uploads/1/3/4/3/134334309/3da757e.pdf
    • https://jiziwodamogi.weebly.com/uploads/1/4/1/4/141400846/8349553.pdf
    • https://kibibobufusasi.weebly.com/uploads/1/3/4/6/134643218/2065883.pdf
    • https://kabetatimuw.weebly.com/uploads/1/4/2/0/142056182/zovetixososixijil.pdf
    • http://epmachine.ru/d/files/21302465268.pdf
    • http://linklandhotels.com/upfile/editor/files/52754642836.pdf
    • https://kasikijafeke.weebly.com/uploads/1/3/1/4/131406722/1a3ebff.pdf
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/8578465.pdf
    • https://volaziwel.weebly.com/uploads/1/4/1/9/141981064/9755027.pdf
    • https://dedelazixuni.weebly.com/uploads/1/3/4/5/134596723/toworire-fivugu.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/48729272578.pdf
    • https://cqhuaan.myhost360.cn/upload/files/03-13-02-01-37-79.pdf
    • http://atya.eu/files/file/52162980855.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c314.bin
b20d6bb18db7f95e2f79883091d38bdaab9dfaa55e0799b315be6bc64a852039
pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 11000 bytes
font_01_sfnt_off0000dc9f.bin
7dea0de021d3fe7d721bab0e60be425dfdfd4f41e4d7d039a7cab36b5a5124d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9F 19052 bytes
font_02_sfnt_off00010e86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16792 bytes