Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3c4874634940c7…

MALICIOUS

PDF

93.2 KB Created: 2021-09-13 10:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd2514b410ae92e308183a7f3ace1241 SHA-1: 693f87c0292195936b53ba89d5abfb44c91b07a7 SHA-256: df3c4874634940c71f7bd54f82cd1921e6c32889f3ced1ef3d622e8290a28b39
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many of which are linked to disposable hosting and appear to be part of a link farm, suggests a phishing or scam operation. The heuristic 'SE_LOLBIN_RUN_COMMAND' also indicates suspicious command-like sequences within the document text, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://coretry.ru/uplcv?utm_term=download+7+habits+of+highly+effective+pdf PDF link annotation
    • https://heart-calligraphy.com/uploads/files/202109031155182218.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/20169620980.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/84253117943.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/62884745711.pdfIn PDF document text
    • https://12shio1.com/contents/files/43116908864.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/xigebubawazidatetutos.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/visigusomalosamevet.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/riwuwevodubusobi.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/62246484813.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/63282677835.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8510238f5482b47b04ee058469dc0e53/29128285435.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/makinevowamomimapojefe.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/79853482480.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/lc9pbgesdu5deebotuffnkamrm/73376050935.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/piwuv.pdfIn macro / runtime command snippet
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/40480095869.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gunanidekow.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630728633_05f94d56ca.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/84842298250.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/gololexelufuzu.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/muvasoxufiwubekululepefum.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/2942460107.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/tusatebikuzinifetesupope.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/gewuvejepagevezuwigima.pdfIn PDF document text
    • https://www.pietri-autoIn macro / runtime command snippet
    • 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_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C34 11256 bytes
SHA-256: 2d7c7c0099b0a276dfa62ac976542717496c08fe1b882cff551dccd37fc17749
font_02_sfnt_off00013640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13640 18772 bytes
SHA-256: 885513dcb4aa468e2e979cbf130dbc7829a528e40e2fcc6639291daad5ef13e6