Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a195f74b2328e4d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-18 19:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 839b42b1d5e61fbce48a03ea9edb7ffa SHA-1: 37030b6ae71c0d0840a0c65a6ee8d35d075e6ffb SHA-256: 1a195f74b2328e4dfc75151a67368b0b66dc8810a62f95b7966a8ab66819dd58
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deceptive practice to host multiple PDFs on disposable domains, suggesting an attempt to trick users into downloading further malicious content. No scripts were extracted, but the overall structure and URL patterns point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/8668c0dfc3fa12c8d757cc2afb44515a/97456451001.pdf In PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/36372991456.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/gabaxugexiziw.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/73463280041.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/74949266349.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/dazexatolizetubadaxew.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/gizilevirotu.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/57940642664.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/92329612320.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/zalurojugagakavoxa.pdfIn PDF document text
    • https://basisangka.com/contents/files/xuvujimi.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/muxizurexupotekukasi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16140e696f38ee---letulesowid.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/tenesamu.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/56620708237.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/sakimudukuv.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/suvatibi.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/relekujavuguzimide.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130367fdb327---31742037018.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/giruzokufifewonul.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/virogawozar.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/66198353455.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/xutidifuledewop.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/bapebukatubenekepe.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/80808293210.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109101206052522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dragon+hills+hack+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_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 10740 bytes
SHA-256: 0ced945a99a5d04f41f4a04a1f94d9c594a1dd5afd462573f47155d0b7d3428e
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 17728 bytes
SHA-256: a14810c537a7c8917bbabb902bd231ca59bc22b8b552a6a6a20c568eac7ba27d