Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd79d90c8ad7533…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 10:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b7d4fc2b135f28108d16d3cec1ecce55 SHA-1: f831d1703206dbec1ccbe048e5b426daae374abe SHA-256: bbd79d90c8ad753321d9b2ebc86920b0d4253c49fdf8abb6302b33edd01af7de
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malicious PDF. The presence of JavaScript points to its use for executing malicious code, likely to redirect the user to a phishing site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://ketchas.ru/uplcv?utm_term=free+usable+credit+card+numbers PDF link annotation
    • https://hizlipin.com/calisma2/files/uploads/budizaf.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/xebevikativi.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/wezoxajonekugogi.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/83461541865.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/97458307118.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/pibotesajimuf.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/15071814165.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/91704209186.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45713232363.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/liwepimopegiporoposipe.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/66256114191.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377bc9618c7---logun.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/nesukijidugomuzixunaw.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210923155614.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/56531024740.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/aodj19jvmn0jt02poo56g1sch4/vigarenune.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-3/20210903000152360029.pdfIn PDF document text
    • https://okul.gencreklamajansi.com/uploads/files/94117918066.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/feratu.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/49591399960.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1612f462197956---wisozarowotabadinakozag.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/jozetudubamujetaw.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/88696280995.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///15540202778.pdfIn PDF document text
    • https://ptogel2.com/contents/files/56107472088.pdfIn PDF document text
    • http://ipceurope.be/assets/file/78205136219.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_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 14648 bytes
SHA-256: d74da58729c099e6ea77b567f5a0596e8b8eb803b55aada8f7c158c6a1cd12ac
font_01_sfnt_off0000d4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F6 10628 bytes
SHA-256: bd4be51c2b34c3a51bb515ad032666f3909c057fb8422a47f789b5d939941ce5
font_02_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1