Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7475bb13390892d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-18 14:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6df10f58ad10a5616f4589fb64200de SHA-1: 203465ba1beef5cf5b1fdd6c264dbe023f816c9e SHA-256: e7475bb13390892dc97141afac500ce5850ab93fad472d7eb6e270895819415f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 6

  • 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.
  • 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://behbehaniprojects.com/uploads/files/wopin.pdf In PDF document text
    • https://danfort.lv/userfiles/file/mokivewolole.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/3474792327.pdfIn PDF document text
    • http://jaqalsports.com/files/file/xujilezukisezevoz.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/49452299040.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161423d8d99ef7---fefero.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/kujuwadojosikavokalubiluv.pdfIn PDF document text
    • https://ontech.vn/images/ckeditor/files/4084088178.pdfIn PDF document text
    • http://www.flamanville-76.fr/upload/file/sorexakotev.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/junafunegarevive.pdfIn PDF document text
    • https://escolaalfa.com/userfiles/file/vusigijetagotekajor.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161400754ecb5d---13215191224.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/korunukabifagez.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/91204049941.pdfIn PDF document text
    • http://amandamaitland.com/images/file/dakegenirijinatesopofod.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/sunevofosanaf.pdfIn PDF document text
    • https://dhrc.in/userfiles/file/8608035390.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/89967558305.pdfIn PDF document text
    • https://coevent.ru/upload/files/fisavumokefagebumerubug.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/51543255832.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/suvetowaxebuj.pdfIn PDF document text
    • https://vleek.com/uploads/files/fozidujavusovug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=amazon+cube+apkPDF 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://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_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BD 18436 bytes
SHA-256: fa4209423daafaa184a7837106e1bbc4bba93e8d1ee59327cc1fafd77f3b3743
font_02_sfnt_off000116c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C5 10404 bytes
SHA-256: 25511b2e4b2c96c71e984d1055f7e8efb9476d9672958f91d33b4074cf589f17

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