Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46e6d479c5b3405…

MALICIOUS

PDF

73.9 KB Created: 2021-09-29 00:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26b61ae98c5244bca9e2974af5f1ee95 SHA-1: c377b37f1eed3648efece28c3ca295cc65c16815 SHA-256: b46e6d479c5b3405306a281df37048ad58f29330b7bf713a577c1589f3bd3369
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or malware distribution vector. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=reproductor+de+videos+android PDF link annotation
    • https://pgp-puh.hr/fck_media/file/juzorutobivimakut.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210921171457_277t9x.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/dagetizidexizam.pdfIn PDF document text
    • https://partnermind.cz/images/files/gavizunixadukigazodoj.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/41870207525.pdfIn PDF document text
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/gazuxobazujijixosi.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/moviwipotu.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/4255410718.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/50902517022.pdfIn PDF document text
    • http://livestocktool.com/d/files/netutozaxumoxujovaxoleda.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ad981f39604a483b2302c9089030a7f3/vabelopavirezixaxafu.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/kevesaxofuxabarenupuwen.pdfIn PDF document text
    • https://halkapsikoloji.com/userfiles/file/xerupugetupeboliwoviw.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/nuxefu.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/56353717743.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/64955515433.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/60278585920.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/fupamiluvakuketokolo.pdfIn PDF document text
    • https://trystsalonri.com/images/file/37771651616.pdfIn PDF document text
    • http://esistore.de/userfiles/file/witowalagopegatusoju.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/41626486090.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/74159457447.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/gamilulazazigadened.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210911042212_zo8w3v.pdfIn PDF document text
    • 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_off0000bc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC03 10672 bytes
SHA-256: 5655ece04db6b684776ceab225debd0ef35c40eb74d384381179e824faf6cfcc
font_01_sfnt_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 17700 bytes
SHA-256: fba8e4fcf6079c1cbedcbc49a080ca216e1b789f421b8348baa7bf83df3afbcc
font_02_sfnt_off00010241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10241 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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