Malicious PDF — malware analysis report

Static analysis result for SHA-256 625fb219800d96b2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 20:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9cda24955b82edbd8d691ff731454a7c SHA-1: 974e4c2162f2e3bdb59a56b93d9ec902f283706d SHA-256: 625fb219800d96b2479c30190b95ffa77ef92cc5239739d7bb1a0eda95a9432d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware download sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=security+basics+for+computer+architects+pdf PDF link annotation
    • https://arhometutor.com/userfiles/file/rerud.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/74d068206af574c406f824e326219b9f/gusanix.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/ziwebejawixuxefanigis.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/rigejolaguno.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/noramo.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/gomedusakewotikaxelegupe.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/51041003182.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/pesekozax.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/wituk.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/katuwatobidekozutugivajum.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/nopimetu.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/jaxijafoga.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bulovifepolusevubixudi.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/6727648881.pdfIn PDF document text
    • http://www.catedralirodahaz.hu/data/editorfile/97136193592.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/89351417862.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/xibowuvavutazow.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/navuxezifudoba.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210901125412.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/silowisifofejamabon.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/butere.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613000e12b75f---xiruvovojenewilekomugu.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/nisawarawufivulogovifebu.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_off0000e2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F3 11164 bytes
SHA-256: f4ab7522326f02a925d6b0c4c36459d353b9c1498f90ce9938a2518e2a8d45bb
font_01_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 17388 bytes
SHA-256: dc2bd01633bd18a2e8bf90fbd869329286d518183ed154053611209f0bb53364
font_02_sfnt_off00012a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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