Malicious PDF — malware analysis report

Static analysis result for SHA-256 543ef5d33a3f9042…

MALICIOUS

PDF

79.6 KB Created: 2021-09-13 23:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 28a9d47f25bb004e87abd97ddeaecac7 SHA-1: bad6f4acfd223837b809c6ad0f03e01329ae1b83 SHA-256: 543ef5d33a3f904276017d3cb5ac0db6813605de3d592816a9186a474229f085
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ML classifiers and ClamAV as malicious. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable hosting, suggesting a phishing or spam campaign. The embedded JavaScript likely facilitates the redirection to these external sites, which are often used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=android+11+update+for+redmi+k20+pro PDF link annotation
    • http://spbi.cz/res/file/16708963108.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/98711979928.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109110244537441.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/gaxumesaletejos.pdfIn PDF document text
    • http://www.pilatesyoga.hr/files/files/wowusamuludura.pdfIn PDF document text
    • https://www.rapn.ru/ckfinder/userfiles/files/23398693843.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/luwivijixakudaki.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/xesavojupukiva.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/a1ad89fc7408b17a766dd65dbf2d8ae3/5035788591.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/xemizeto.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/kasojuwuxenigi.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/pamigefinowapovojiga.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/3755320938.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/47916329729.pdfIn PDF document text
    • https://solturism.ro/images/file/32049310565.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/walibape.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/97777089473.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/mosos.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/pivamepajoz.pdfIn PDF document text
    • https://506hlapeta.com/files/file/55028708955.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/54019598706.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/fopegedugubogumosuraberag.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133c5be8a546---55514665163.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
stream_003_off0000ffb1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFFB1 10912 bytes
SHA-256: 95da9053132f7787af163c17f0facc472abe4c15e7db611ad0f8d3ea500d7cf9
font_00_sfnt_off0000d350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD350 17188 bytes
SHA-256: d00c39bfe011f1af49f2ea0f0da477da80c10787c5d2a26faf359eb4b5d697dc
font_02_sfnt_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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