Malicious PDF — malware analysis report

Static analysis result for SHA-256 85944411a3a40a74…

MALICIOUS

PDF

75.3 KB Created: 2021-09-10 18:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60f993e3c4fede91a5595650f3077ab4 SHA-1: 07d466eaa33c7f3a8a3d4c957ca86b32738f1954 SHA-256: 85944411a3a40a74afcf1860ac49b25e29e4af74ffc281f5c806b9655bdc1895
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous embedded URLs pointing to various domains, and a heuristic identified it as a link farm on disposable hosting. This suggests the PDF's primary purpose is to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://insinkerator.us/images/uploaded/file/34958233500.pdf In PDF document text
    • http://ck-buhgalter.ru/userfiles/file/92913736705.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/051014292297.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/fuwopufiperixir.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/70228499749.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/pajepadixolazofiwejixupip.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/1742490668.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a325e0bb5---jenomuf.pdfIn PDF document text
    • http://bonsite.nl/phpcmsys/file/72485658598.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/donomedupebibizosisepodet.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/pukunitupibal.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/nivejoretudoniruw.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/18449995467.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/nilavuxaxogumurodisuzopag.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/91730740453.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/kipukikatubovopefowef.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/xinukovixipe.pdfIn PDF document text
    • https://clinicscrm.com/img/files/furoxakupilifamoxupox.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/fejojegunokubejowa.pdfIn PDF document text
    • https://rajaunited.com/contents/files/41060602388.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/26728054903.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k7ed66ucnhe2vn0u3l2d2990u1/1363494846.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/50601066213.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109081620093910.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/20080964909.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/45079289923.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/liwabanofujeferoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=best+skate+3+playerPDF 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_off0000c3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FC 17148 bytes
SHA-256: 7e7dabc4ddd7d912ae803f9c1dd302602535d53f1a7742cc363373db7997217a
font_01_sfnt_off0000ef7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10794 10360 bytes
SHA-256: f39b99c7039db1778ecb11ddf78fb945524f561627bed0234bda3acd1db277d8