Malicious PDF — malware analysis report

Static analysis result for SHA-256 809470eabd5d2b94…

MALICIOUS

PDF

83.3 KB Created: 2021-10-06 07:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: efd1aab67175debca1c8db3fcd318002 SHA-1: beae90f1545818ad41affc4abdfa2be74f150a5b SHA-256: 809470eabd5d2b948ea791d8f4a6a7ceb68c8f1f56e266a134f46f2f035d536c
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://elard-group.com/ckfinder/userfiles/files/64992592867.pdf In PDF document text
    • https://perfecthospital.net/FCKeditor/file/82651525719.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tafomojurovefapepujeze.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/xirezotoriwipuwonit.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156475c41d03---70104718326.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/61645817238.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vuwezexejuxogozepinipav.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/vaxunogesasovizudalajo.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/xulajegewemedi.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/dagaboveroxidomu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/92130928103.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/65004648273.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/remekoxutetof.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/xezanofuvuguzujarigelik.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/zusojilexemorofuvetid.pdfIn PDF document text
    • http://bitree.ru/ckfinder/userfiles/files/selidilixemavuto.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/lowopikaxigegurujebafati.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/fesufiranavize.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/6694830388.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/dubufezuxasudoreg.pdfIn PDF document text
    • https://refurb.onlineconvey.com/userfiles/file/99276734585.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/balojewofazololexonipesul.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/nigagikamutajixasexiduva.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/37625710754.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/71263030030.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/jigadujokapom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=lamour+love+all+over+the+world+mod+apk+downloadPDF 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_off0000db16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB16 10700 bytes
SHA-256: ce716b349dfa99bf18993756bfb372311e5b72e1ddbc9fdd87887fdde3f22d13
font_01_sfnt_off0000f378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF378 19916 bytes
SHA-256: 9ed377f938379dfc61bbc59d8cb4320356d34a78b7d6b2215787b513e236a0bf
font_02_sfnt_off0001270a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1