Malicious PDF — malware analysis report

Static analysis result for SHA-256 db226d07a2d81613…

MALICIOUS

PDF

96.6 KB Created: 2021-10-08 02:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 09adb5183ab4ffe231fc5a3233a55a9b SHA-1: bef7d1b55a31badece8a8b3fcae1bd5d8c77dcce SHA-256: db226d07a2d8161324b26497d481e39213470a40b9527bc7258f6ff8b0bd4a1e
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, likely for phishing or malware distribution. The presence of multiple unknown URLs suggests an attempt to host malicious content or redirect users to compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

Heuristics 5

  • 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.
  • 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://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/97647034541.pdf In PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/jusom.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911005150332319.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/42065358790.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/99359280683.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/69739174985.pdfIn PDF document text
    • https://12shio1.com/contents/files/momuriwogapu.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402e379f353---5906837967.pdfIn PDF document text
    • https://meridianchem.com/meridian/ckfinder_userfiles/files/xofujileto.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/15242715415.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/ripulikaj.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///pagonekajepi.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d941d6554735674fab6fe3407b1e6c34/beweputexulavibiwemif.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/bajezi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/savegorosinakexipube.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/53575225921.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/sosavatifozijoligusuj.pdfIn PDF document text
    • http://germainelecocq.it/userfiles/files/nunep.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/88625088993.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/riratipime.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/ginageju.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/dobalirofinozi.pdfIn PDF document text
    • http://grotech.in/userfiles/file/dakivesokimifojite.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/69095540431.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/90233615147.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/pujodisalimajuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=indication+of+low+hematocritPDF 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_off00010f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8C 10608 bytes
SHA-256: b2b15ca51bcfc35a6491c23dc0469c90ca5f67517e4b94f88ec999f559b9bc49
font_01_sfnt_off0001279b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FAD 20472 bytes
SHA-256: 11665d036ad0429da6633c8a0d1e8a01c2e1e10cef3f47504856bbe9afa31803