Malicious PDF — malware analysis report

Static analysis result for SHA-256 945d744adba5e2a9…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 13:12:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b74e460dc7a3fe7c49583e0e87cfeae2 SHA-1: c15e3384dcff235c386204a874b84f79f0207084 SHA-256: 945d744adba5e2a917d42adafcd8efd1810497301b3de34d48bff1bb423043b6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous unknown URLs suggest a link farm intended to obscure the ultimate destination, likely a phishing page or malware download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://hanurichurch.org/ckfinder/userfiles/files/88544642917.pdf In PDF document text
    • http://hc6999.com/userfiles/files/66027075683.pdfIn PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/beziruwifowes.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/zanudipawagokenigasava.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/61909367255.pdfIn PDF document text
    • https://digireg.com/upload/fabisaxozemawu.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210911/16313150452379.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/95810273536.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/11158578386.pdfIn PDF document text
    • http://artediapharma.com/upload/files/45845005613.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/govosapi.pdfIn PDF document text
    • http://labradory.pl/file/tirawasosapenuwesezi.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/vixobusevowutelasijana.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/424711327.pdfIn PDF document text
    • https://media-get.com/userfiles/files/nexagupuvogatakagakuzap.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131740fd924b---84615345716.pdfIn PDF document text
    • https://irantruck.ir/data/file/57407321274.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/5521660009.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/23787449433.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/11071858261314bf854613.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/63326804795.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210907075025.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/koreden.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=curry+noodle+salad+with+mayonnaisePDF 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_off0000d6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EF 10844 bytes
SHA-256: a4a0ba9fade820b7377ec5ae4cb02d73c0ee9fb4b5aa5bfba0c352b562303121
font_01_sfnt_off0000efe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 18212 bytes
SHA-256: 3e3b8170f9fe3544711a6ea0465feb4d13fd2d2cd46e0639e40310fc401018a4

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