Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d2addb0822e15…

MALICIOUS

PDF

88.4 KB Created: 2021-09-15 22:27:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a568b2c50dc60ca7194e1f956391366 SHA-1: 905468f3a545471900f4c139e87a7822f2c711f6 SHA-256: f40d2addb0822e15af3d083285dc0e4797feba84317ca45f6440f01a658de9af
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of extracted URLs indicate a strong likelihood of this document being part of a phishing or malicious redirection campaign. The embedded JavaScript is likely intended to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.la-rocca.pl/app/webroot/files/files/29584307224.pdf In PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/risemibozekenuvizixi.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/gebawekewudegovenes.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/vimuwetugabarimerijuda.pdfIn PDF document text
    • http://sarica.com.tr/ckfinder/userfiles/files/tujoxigigiluxofu.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/30966177011.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/61908167643.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/kegexevikasokoviwuvazorus.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/14136487519.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/37709939753.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mefolaradenokag.pdfIn PDF document text
    • https://soechi.net/userfiles/file/39121988213.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/mimipe.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/161334e2ebe17f---wixeranoxipigulevuxuxezaw.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/18671087711.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/lufomilijilad.pdfIn PDF document text
    • http://axwelindia.com/uploads/kunuzojewopokevu.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/jetefefufiwip.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/92464653035.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/34417426239.pdfIn PDF document text
    • https://htchninc.com/d/files/76001822161.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/91991698112.pdfIn PDF document text
    • http://csc025.com/userfiles/file/20210903071706_7jf3rg.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/jabedufusexelamesive.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135092dcbd12---xaposudaluxexixowinabusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=como+instalar+emulador+de+android+para+windows+7PDF 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_off0000f191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF191 10820 bytes
SHA-256: 60909feb1f226871f7179902ee449e64383448e092397ccbf3ca776a5fac01ba
font_01_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 18888 bytes
SHA-256: a7a5908ecbd15f381ea36aee6f3c60f44799d725558eb6f59e2ed338cdad7f44
font_02_sfnt_off0001393f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1