Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d6ec7673221a40…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 16:44:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d630413b738c462280f83893b8b2fcba SHA-1: 7213f8146192d99b5e087e6973ba602958a50a48 SHA-256: 40d6ec7673221a407d662004942edf7a56ab92eefb69fce55d8c1e2cee556014
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 and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely involving the redirection of users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://krisoc.ru/uplcv?utm_term=sd+card+use+in+android+phone
    • http://kppzp.pl/userfiles/file/39388365966.pdf
    • http://verzorgingsindex.nl/images/uploads/tarigiwimativibadibovubeb.pdf
    • http://incomsistema.ru/ckfinder/userfiles/files/nufetaxegiraponorijexaza.pdf
    • https://happyfun.tw/uploads/files/202109071234371667.pdf
    • http://bjsddesign.com/filespath/files/20210912051050.pdf
    • http://murzilka.biz/images/uploads/file/21764015295.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tpq1k6eepf4iavi2u3bllbuqq1/85702361797.pdf
    • http://kino-cosmik.ru/sadm_files/21966430500.pdf
    • http://bestbelly.org/content/files/files/92201177313.pdf
    • https://www.puskinas.lt/ckfinder/userfiles/files/kowise.pdf
    • https://hediyelikhanem.com/calisma2/files/uploads/fosapinide.pdf
    • http://landonintergroup.com/ckfinder/userfiles/files/mirirusivabozufilapawad.pdf
    • http://www.pvvc.cz/files/77337562705.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613746cee1d8d---zexibulim.pdf
    • http://vencedor.coop/images/admin/file/wajojopawukuzirupip.pdf
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/rojilo.pdf
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75437991390.pdf
    • http://videofilm-tv.ru/content/File/83362325952.pdf
    • http://hockeydh.com/files/ups/files/3696577481.pdf
    • http://fst-uinsu.net/userfiles/files/71340622836.pdf
    • http://baovethanglongmb.com/upload/files/zogezumazar.pdf
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/41667590105.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_off0000ef9c.bin
3f8e992f08043b9e8b27c35d338598127016f13f9eee9c3b4eb25446c090bc9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 10640 bytes
font_01_sfnt_off000107cd.bin
50c3432d3f5ac42a6e87306a3d4747dff84d3c33b6169574e051e774a720b174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 17788 bytes
font_02_sfnt_off0001366f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1366F 16792 bytes

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