Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9ffb044b66e3a9…

MALICIOUS

PDF

68.4 KB Created: 2021-10-03 03:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 088dfb5fb4562445790f567bdbacadce SHA-1: f0a3741212fa496851792327fe3e3cda2fe76bfa SHA-256: 1f9ffb044b66e3a925d6e57b00970738981db454ca058ac21f14ffa9c7d3b9f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=calvin+cycle+reactants+and+products PDF link annotation
    • http://www.lircai.com/web/inline/file/49244745053.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/17660434180.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/vunexulit.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/lilovizivuxum.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/fugesegewe.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/10943046849.pdfIn PDF document text
    • http://dentalclinicbangalore.com/uploads/67105155963.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/80106109965.pdfIn PDF document text
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/16467308849.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/51231285905.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/gijifixuwo.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/guren.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/zedepevaxitosiruwotefej.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/61819844611.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/pimusem.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/wataxeromugatebawulelura.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/53806077202.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/laripumimadav.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/fuzuraviporofenirasa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4925b7ffa7cf368327191d28aa3380b6/67796423451.pdfIn PDF document text
    • https://pomtco.com/technical/files/file/94752833990.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sufogezafov.pdfIn PDF document text
    • http://totoumi.jp/upload/file/94066734004.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_off0000ae67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE67 14668 bytes
SHA-256: 5bed74133abb9f636186061a19300d431c9442b383e6a1e4f48dd0a9058d9f8b
font_01_sfnt_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 10820 bytes
SHA-256: cdd4efe1e190c7eac73602d32380a8c82f2c9ef5dd0c7c3340bef8c5be110b2e
font_02_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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