Malicious PDF — malware analysis report

Static analysis result for SHA-256 a256142f3a01e519…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 02:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 051d97baf8e3996aca46b0d56dcf5bbd SHA-1: 4364bc0732bcefb4a4affa489607b4a11720b480 SHA-256: a256142f3a01e5193c460b8b0dac5757f8094c85b4dc365a673f1b087f375e74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many hosted on suspicious domains, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://twr1115.net/files/fckeditor/file/76316200873.pdf In PDF document text
    • https://triatlonshop.cz/userfiles/file/15320941179.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/vepakisodapupizuxod.pdfIn PDF document text
    • http://comitatoamiantovelodromo.org/userfiles/file/42092179117.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/seniwuloxapis.pdfIn PDF document text
    • https://voxel-avocats.fr/uploads/file/In PDF document text
    • http://telektrans.hu/editor_up/zejobewurapumiwivibadoxim.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/polovofa.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/65675284651.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/70096825674.pdfIn PDF document text
    • https://renetravel.ro/images/files/jubagizejevakugiwumexoxe.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/zazikubevusul.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/87622820668.pdfIn PDF document text
    • http://synfarm.com/upload/files/63130775572.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210911_153426.pdfIn PDF document text
    • http://progetec.org/userfiles/files/88970708323.pdfIn PDF document text
    • http://mps-india.com/userfiles/files/dejaledisezafidevevipifet.pdfIn PDF document text
    • http://elsped.hu/files/file/furalelarovomuvunim.pdfIn PDF document text
    • http://dxline.eu/userfiles/file/438972621.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/30077524858.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/36443881961.pdfIn PDF document text
    • https://nistd.in/userfiles/file/53597184952.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/71918971055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=bluetooth+file+transfer+not+working+windows+10PDF 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_off0000ad8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59F 16064 bytes
SHA-256: 66b948ea44096da655615b94e37b2e56cd7a0577a634800bc9958b5c999ef9ef
font_02_sfnt_off0000ee43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE43 11136 bytes
SHA-256: d3aa9377c2cadc2f06543b7d94aa6edba1214dcb4e97b7c7f628b0519ccc9c54

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