Malicious PDF — malware analysis report

Static analysis result for SHA-256 9527197df4d9aece…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 06:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d27740b8729c89775116f93c840b04f SHA-1: d5d0250c13258c2465c8a8494b6276f91885a7ee SHA-256: 9527197df4d9aece71bc2f3ac8e358a3dda8c69d6f2a6c067efc96cf4e4b4b35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, suggests a link farm designed to redirect users to potentially harmful content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights this behavior, indicating a tactic to obscure the true destination or distribute varied malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=avengers+wallpaper+for+android PDF link annotation
    • https://bike-accessories.supersites.gr/content/ckfinder/files/felen.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/37314863414.pdfIn PDF document text
    • http://packamate.com/userfiles/70441488883.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mavavulosazudizezetuzaje.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/69497670601.pdfIn PDF document text
    • http://headrepublic.pl/images/files/25648489632.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/44384466673.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/9715160335.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/xovumo.pdfIn PDF document text
    • http://njxinbell.com/upload/files/laxovunikanepotofobulujar.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/42500238682.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161436aa06caed---pemarisiratikomuti.pdfIn PDF document text
    • http://eventechsite.com/files/files/81527136432.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161316be13904d---53202302642.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/6095090480.pdfIn PDF document text
    • http://lpxs168.com/filespath/files/20210903003553.pdfIn PDF document text
    • http://dakmet.pl/upload/8224692291.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138424cb4a29---92789088692.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/13549704150.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/xogedoniveko.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/bivutuzajubudefupikepogaf.pdfIn PDF document text
    • http://synphabase.ch/upload/file/fegamojiposi.pdfIn PDF document text
    • 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_off0000bf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF2B 10708 bytes
SHA-256: d9265c6af51e09089bea80ccde25fb051784b8527b0564227bd5bc0684591987
font_01_sfnt_off0000d7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 17328 bytes
SHA-256: c5df1248a43bab0b22ab24168f2331cf9085adbb79065d293865eccc440829b0