Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5432db80b1ff70…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 13:32:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95561bd868a44b5e034e9bb02153048a SHA-1: b6eb6b1e8e26f283482d3f3644714059cafab837 SHA-256: 9b5432db80b1ff700020343dc6f705f6828f864e78a3d572e1677c98fb3f9eec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for malicious PDFs to execute actions. The heuristic firings indicate it's a phishing attempt and contains numerous external URIs, suggesting it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=bike+xtreme+mod+apk PDF link annotation
    • http://dolgoprudnyj.inhome360.ru/admin/ckfinder/userfiles/files/xataliki.pdfIn PDF document text
    • https://mmrh.myagenda.cz/pictures/editor/files/62489070902.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/52581592150.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da79889058---33890594838.pdfIn PDF document text
    • https://pcetravel.com/files/file/71979579258.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/wixapu.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/90987668117.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/degid.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614db140a35aa---36389577568.pdfIn PDF document text
    • https://allianztc.ro/files/file/pezafazogetusam.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/tosoxek.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/pavuzosamodexur.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/34893790933.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/35569412610.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/jupaxamivuxoruvapaji.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210919_E6C0842A7C0FA28A.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/vovakeno.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/36186260047.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/nelawalewazepexabap.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/55616897780.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/86174057355.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/dijej.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/kimenumubaxixib.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_off0000b2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D9 10484 bytes
SHA-256: a3290a948df383b26afcb846a7a5083a16c1999d2002879b778456c45a008541
font_01_sfnt_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 16596 bytes
SHA-256: 0867adac77293fd176c8c8ec9426ddfcfe5b21e99f2d6318a686e076163440c3

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