Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d2b99fbb484765b…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 05:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c0aab972823c93a1d1e1d10dae80d54c SHA-1: 0c6f21fed74f8694f835ca2e0261394a132b4f38 SHA-256: 0d2b99fbb484765b0ea61ad360cc1d0e1fa7dfb40397fb792a7ac1dd6f235f18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to link farms, and is flagged by ML classifiers and ClamAV as malicious. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a deceptive structure. While no scripts were directly extracted, the overall pattern suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lanegarrett.net/userfiles/file/duvesosudi.pdf In PDF document text
    • http://birizgardenhotel.com/userfiles/file/78672511993.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wetakituwuwesesixefal.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/61566235840.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/navalisawe.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/41254488925.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/dokeriwubetapesolema.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/10881268750.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/59750975483.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/degiwuwofuxo.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/burupafumizufa.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/zowunejawinevuwijeni.pdfIn PDF document text
    • https://eurochen.com/UpFiles/WebEditorFiles/file/lojuxuf.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/34570389080.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/53fbded92d5ac4481e205c927f6f571a/tesokojosoxosugemitaf.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/fanitijetegoranu.pdfIn PDF document text
    • https://dm288.rs/slicice/file/wudebopo.pdfIn PDF document text
    • https://swiz.eu/files/editor/97637807320.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/28475282041.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/timokobosugazudifetetox.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/88008549923.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/91384882357.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16136755947e6a---kobizabowawifufes.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/zegase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=photo+lab+pro+freePDF 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_off0000d494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA6 17132 bytes
SHA-256: 48067b0ff7210d2f4308e41eaf9d8f18c310a8d71c5434ca419e89e5d107408d
font_02_sfnt_off000118e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E5 10232 bytes
SHA-256: dd65cba62c4f9f090876db2212f7553ac91097f65d320450678e439966d05f44