Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff4ddde8c9c2519…

MALICIOUS

PDF

71.5 KB Created: 2021-10-02 13:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 292e15e169a147e996d7164b02b76fd3 SHA-1: 32b5f47ad6ac9cde663faa84ffb2d503f04129bd SHA-256: 6ff4ddde8c9c2519ce3231d5877b78b19f770301808baa7fa7ac322968da40a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it is a link farm on disposable hosting. The PDF contains numerous embedded URLs, many of which are likely used for phishing or to host further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics strongly suggests a malicious intent to redirect users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=counselling+with+reality+therapy PDF link annotation
    • http://www.sas.edu.mn/ckfinder/userfiles/files/dirimubebumil.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/susowegutifivoxifomewoxe.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/15364525274.pdfIn PDF document text
    • http://elitvorota.ru/f/file/sebes.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/83477974304.pdfIn PDF document text
    • http://trungtinjsc.vn/upload/FCK/file/rulokuwif.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/68044912676.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/81118114353.pdfIn PDF document text
    • https://metagrhyd.com/infopub/pub/file/88551539904.pdfIn PDF document text
    • http://keitbg.com/images/files/25836248728.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/91898578369.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16331556294846.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/razadajulibojutekofufa.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/40928717086.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/54052236365.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/87002900807.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/73160751825.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/98597991053.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/tifijibinalipanitaruze.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109080610386456.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/xijozeduzi.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/sojeda.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/70f21f2fbe18023664fdc613905179bf/62815655992.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/xurufivikuzabodebikizevo.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/lepiwapu.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/78089301289.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/sugaw.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_off0000b5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BC 16288 bytes
SHA-256: a3abddb0814eedb7338426893e53963a7f486103da64461b90135adca363ae39
font_01_sfnt_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C7 10864 bytes
SHA-256: bc3b137cd0f95280bee218bdadcdf3b71a8b00023f0b0bb02b6924b3446e8896