Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16d716bc8659214…

MALICIOUS

PDF

88.9 KB Created: 2021-09-08 19:25:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48caea23b51495723c3fb1190d73bfff SHA-1: dd380c3b9f56d0cc893e7fefda7b9f1c65c5baab SHA-256: c16d716bc8659214611f537a68d103afa7f0f4cce0a0554b2a501c6ed73f4ed0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating an attempt to redirect the user to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://www.jacenter.org/js/ckfinder/userfiles/files/metalituzavuxifekutibe.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/witizuxuzuxelegidoz.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/reruwiderojowebemorili.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351f43aca62---10756636522.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/toraforako.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/87609136623.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/42015116248.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/62458094670.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/vapesibitiloxelol.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/bemujaro.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/gigevovepoximabidabufis.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132a32bdbc5b---judalozoloxes.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/41807754873.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/76118310746.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/19150074297.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/17965864805.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/dokorokukubo.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nesopobafivifew.pdfIn PDF document text
    • https://electroagro.es/pub/files/9026564646.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/55669449110.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/xerudewawagaxibexaxotas.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/subodefofusofukafibene.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/sezupavikegi.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/kibozubikup.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/puvijavufuzetojafixaj.pdfIn PDF document text
    • https://tipresentoio.it/images/file/90690052359.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/lodazaginoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=t%E1%BA%A3i+ph%E1%BA%A7n+m%E1%BB%81m+n%E1%BB%91i+file+pdf+mi%E1%BB%85n+ph%C3%ADPDF 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_off0000e583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE583 11204 bytes
SHA-256: e80d107fdd858c158cb88ea39389db81e910713d9a4af4da274ee49cc611c338
font_01_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 23700 bytes
SHA-256: 14375452103d7d079abcaaddaf0fad8492fbf0b2afa70971fa384e7732ffc34a
font_02_sfnt_off00013b12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1