Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd231ee7dfdf664a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 20:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4b26abfae106aa010f8de7449ed6f447 SHA-1: 0bc3d337dbdf1c1d2eb70bfb48748a16ab3a4291 SHA-256: dd231ee7dfdf664acbe4742dddd995792c7af3ac6806b74d164aa6e794b6fce0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://gibkrakow.pl/uploads/files/zojuxadatowunawewus.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132323c7395f---90667240855.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/43088390638.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/25118118283.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/xezuteb.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/loguxivud.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/beruwem.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/717102249.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/53704164761.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/56767671146.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/lopaxaxew.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/pozinumejevoxakodigo.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/54395820659.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/36237851233.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/82611123198.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/xugadumakesatemopexarej.pdfIn PDF document text
    • https://polaria.cz/images/file/92124707233.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/65698265143.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161445ff59ebf3---zewote.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/luvenomudamuvakawo.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/61182663140.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/30548925996.pdfIn PDF document text
    • https://laser123.com/geektic/files/zusanijasuba.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/kapaxin.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/80510119458.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/ranojovimuvodinonur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=c7+pro+screen+sizePDF 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_off0000dfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDD 10200 bytes
SHA-256: 8c6abc48eb9c913db9da83fe4b40f8fcc0562485805e6081f709b99bad46cb35
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010efe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EFE 18588 bytes
SHA-256: e30cf325847241a844f0b49a28e8e8f1b3992adfd0d4d86a98bf38e7e829047e

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