Malicious PDF — malware analysis report

Static analysis result for SHA-256 82b5e9fd3d15dc75…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 02:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e71938b90a9ab8701a7c5259209ae89 SHA-1: 8c9e463ea645399bee82ffe79bd2dea5f40f92ef SHA-256: 82b5e9fd3d15dc75ea26bd7cf553cbf50c76ad4bf9208df9606f0f1eafdfd726
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that may leverage embedded JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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 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.
  • 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://holcom-solar.com/webroot/img/files/karexaxoxobitim.pdf In PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/63077083361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5793bf733---xofekegezuwilonerom.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/38025102376.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/94830062091.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zixivofonaxuxev.pdfIn PDF document text
    • https://semangkabiji.com/contents/files/57751237964.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/44915079315.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/76405773934.pdfIn PDF document text
    • http://highgaincomposites.com/img/file/2021952520.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rvv1k3u7rab7angg15po85thu4/rafet.pdfIn PDF document text
    • https://umartravel.com/files/fejonubogobitomuronuxege.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/xezakebemabubefinaluvugo.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/13411886510.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/mefosunafimufufotofulam.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/biviniri.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/bofatuviguzuvenovosaregib.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/kadoguforuguduwakelede.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/zugimudapimidilemuta.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/4346364043.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/12641253234.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/visibuzewu.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/94792490612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=a+quiet+place+2+teluguPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 10404 bytes
SHA-256: 842da2bf8745312cb094eaa95a105b66f45740ad445d517fc89c8fb2d239c42e
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8A 19576 bytes
SHA-256: 05b9a4c5012d2da025b1bb2825ea7f211549f57e87108e9f5875d1e4a97293d1