Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2bdf94402e9113b…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 11:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 812b6b489f1b2417942839c445664762 SHA-1: c039f1fb9f3e1dd67ec1cf53005dc73f7e1dedca SHA-256: f2bdf94402e9113b3c61e804f11366f83a4b5b002b110d245828622de083a7eb
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs, many pointing to disposable domains, which is characteristic of link farms used to distribute malicious content or phish for credentials. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://hyper.vessty.com/_img/files/zenubiw.pdf In PDF document text
    • http://thevisionkharj.com/userfiles/files/12260845055.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/pabepuwo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/4g9p94l1nhq9sd3mg8fcooav0q/xemere.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/7692632303.pdfIn PDF document text
    • http://partiaweb.com/upload/files/ripimaruzezupinuf.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/79406819518.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/zulirofog.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/sotun.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/40814854653.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/rifenexefidosawipiti.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/65105204979.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210918010859.pdfIn PDF document text
    • https://majubesar.com/contents/files/44391789507.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/badaxatalokeruguzulekon.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/menuxajakipilav.pdfIn PDF document text
    • https://o-dance.com/upload/files/jesodivilojitiv.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/jozomo.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/pesifoneloxuzemumuwov.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/7509591446.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/25401751282.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hq37okcp3dokflt9gird0pvh6d/15032338834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=play+store+android+lollipopPDF 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_off0000af24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF24 14936 bytes
SHA-256: e26473bdc55dd7de4a6839ff407839f763df36cf71e8446096cab098b86efcc5
font_01_sfnt_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF0 10500 bytes
SHA-256: 9e54462bf5f3fae566fd29a6f8e4b4cf29916f3f4d7263c4f61d17d51df0a0cb

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