Malicious PDF — malware analysis report

Static analysis result for SHA-256 6613a97e9b3df611…

MALICIOUS

PDF

72.2 KB Created: 2021-09-17 02:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 535a68ed3f041cf27de82b105669afdb SHA-1: 576473797fecca3f64305ef279294573a292617b SHA-256: 6613a97e9b3df611d6fab663b18c63bf29fb3281c0877217fba081dfc9ee4594
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many on disposable hosting, suggests a link farm designed to redirect users to potentially malicious sites. The `wkhtmltopdf` authoring application and the nature of the embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://medvor.ru/uplcv?utm_term=mi+music+player+apk+download PDF link annotation
    • https://cornwallstaffagency.com/userfiles/file/74737712217.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/vegadujamavimikikaweva.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/wenekorakodaromixunom.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/vibiwarabo.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/49920997086.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/39382264007.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/57131782012.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/3118814168.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/16372509717.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/gonetorufiputetovebalel.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/9195767382.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/menogeparon.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109131606162403.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/lepililabafukatata.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/valedugasifoladadefewe.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/16726321182.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/68175186471.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/93744310324.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/94692634944.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/59103188052.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8abae476a---zonijoganozigatijuvokex.pdfIn PDF document text
    • http://wohingltd.com/userfiles/84680515666.pdfIn PDF document text
    • http://yanartextil.com/firma/files/74333834728.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/niwedepesajaritadenu.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/56907112633.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_off0000b831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD048 10960 bytes
SHA-256: 6faa5231ce7b30d819057229ad0db88d201c1321b5a4c479caf39cea26943302
font_02_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 16240 bytes
SHA-256: 20550467eda72fb76cb0bb0ac0113604fa02199c5333157da89bad647abf32aa

Open this report in the interactive analyzer, or submit your own file for analysis.