Malicious PDF — malware analysis report

Static analysis result for SHA-256 c250744d1388892a…

MALICIOUS

PDF

93.5 KB Created: 2021-09-13 18:31:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 459168e5ad65e9169e1f4105ad4b262c SHA-1: 01c98e4c0d230ecc982f2ddb5b5c793444515f63 SHA-256: c250744d1388892a23f9f81e7284b8210886197e7af3fbf216c48a7f0b9247a3
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document is designed to trick users into downloading a password-protected archive, likely to evade security scans. Embedded JavaScript streams were also detected, which could be used to facilitate the download or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=how+install+ios+on+android PDF link annotation
    • http://stroytehcentr.ru/images/file/27656036959.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/botadoko.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/wuvetuvogelimumobeviripeb.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/16460760417.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7f8e5f0e---jesupowemib.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/83479018992.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/37034350623.pdfIn PDF document text
    • http://hocomesun.com/upload/batejitawipudiden.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/64638156562.pdfIn PDF document text
    • http://horvathortho.hu/tmp/91082802945.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/mezokuwujudu.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/xorerevonituxesali.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/7550628677.pdfIn PDF document text
    • http://keramann.ru/uploads/files/70894686764.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/49d2ce56b5c5056063546ea589eb3330/5171030086.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/33248737166.pdfIn PDF document text
    • https://masukpt1.com/contents/files/67839533351.pdfIn PDF document text
    • http://sergeybazarov.ru/file/89787837400.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/28935691052.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210902060809.pdfIn PDF document text
    • http://mosjob.ru/images/file/majegujag.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/67306267842.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/zuwegogobivetewavosuloj.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gitoxif.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/jegosak.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/pidazuz.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_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 19024 bytes
SHA-256: ebce227c3d08b5566b59cdcdebe1a32caee501c116c9882d3a2995480ddcbcc3
font_01_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E7 10184 bytes
SHA-256: bff10796142e72fdc845a6e1fe8551791df0e9724171f6793ce4964f8954505d