Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f83beee58d7f64…

MALICIOUS

PDF

94.0 KB Created: 2021-09-16 04:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d1c46749ad2ea265859a55cf8770fdf SHA-1: 84129474e1f0b0652e682258736f6b17d6646158 SHA-256: a4f83beee58d7f64badaf95567822da22d2a6b29f28e89bfdc958c128805b871
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and it contains numerous external URLs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links to potentially disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://oniceh.ru/uplcv?utm_term=kite+definition+and+properties
    • https://trisyscom.com/userfiles/file/63103843642.pdf
    • https://mongolia-volkslift.com/uploads/files/jipetotuduso.pdf
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/40748063064.pdf
    • http://bestorkate.com/uploads/ckeditor/files/97323728866.pdf
    • http://ciarajewellery.com/editor_upload/file/54911921490.pdf
    • http://medianet2000.net/amm_prod/image_news_popup/file/30820884462.pdf
    • https://jokerprod.net/userfiles/file/40673449660.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/71178367023.pdf
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/56121353014.pdf
    • http://stmrcstvm.com/userfiles/file/vurepuwafo.pdf
    • http://kantoromega.pl/userfiles/file/virajavirimolabeg.pdf
    • http://smeeing.com/userfiles/files/14776809327.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/81180972874.pdf
    • http://dancephoto.ru/userfiles/files/58424918947.pdf
    • https://baoholaodong24.com/userfiles/file/dumuxa.pdf
    • http://stevis.cz/files/file/fopetewujeb.pdf
    • http://gruaszarate.com/ckfinder/userfiles/files/sixigazelokuvanotowokazew.pdf
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/rupil.pdf
    • https://eminencesolutions.in/resources/userfiles/file/betoxowonu.pdf
    • https://baoholaodong24.com/userfiles/file/zijidepoguruba.pdf
    • http://ijdssymposium.eu/upload/xigosoguwedof.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a0947c864088f1bb402c8a4215d091d9/63153988596.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/temitudozetidiveg.pdf
    • https://jeneifogaszat.hu/cikkdata/files/3682105943.pdf
    • http://yasairamenbar.com/uploads/files/sidipesivenizatobodufanu.pdf
    • https://aprilboya.com/userfiles/file/judujazodokamimuxurepalin.pdf
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/61436550975.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_off00010a0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
font_01_sfnt_off00012225.bin
61b98d80f789613c20f4187ce1e7ddb5e5c6be183fe0df80355ae85416a4c1c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12225 10436 bytes
font_02_sfnt_off000139ec.bin
c996b0cdb7741e73dab6e5a9acf1306c179d8bfa06c3e29894500aed92f45aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 18348 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.