Malicious PDF — malware analysis report

Static analysis result for SHA-256 448e9bd7cf7a3d75…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 20:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30c21f5b75dd888354311940e70c3940 SHA-1: f47a66939ce3117c4bceb0a51ea07b361887b9e4 SHA-256: 448e9bd7cf7a3d752d22d1082b7054da6703dfb280a9bf76815788d95121c80e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. A critical heuristic indicates the document attempts to trick users into executing commands via the clipboard, a common social engineering tactic. The embedded JavaScript likely facilitates the execution of a second-stage payload, possibly downloaded from one of the listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://flomojapan.com/upload/files/lavifexeki.pdf In PDF document text
    • http://www.vljainandco.com/userfiles/files/xoboditilozolawopazokuna.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/70853555993.pdfIn PDF document text
    • http://hasyo.net/files/file/felusini.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/puzitavevur.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/43992462404.pdfIn PDF document text
    • http://nemochem.cn/upload/files/mefojilurokivunanunugoku.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e45564f6---gasewabotivabunidaviwe.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/18621541416135ee2aa5b6f.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/24376c2421544e9744fbe0c01fdeeac9/5552464639.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/72021275673.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/nuporubutasexefekubejuwem.pdfIn PDF document text
    • http://airsoft1.ro/files/file/97323955397.pdfIn PDF document text
    • http://hnspkjx.com/d/files/vamifejibiguganogup.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/3621697938.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/32554533467.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/90015426273.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/tidumumejizok.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/98537963445.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/7178202917.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/70885733070.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/rinelonefigikalo.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/29553720526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=install+android+os+on+raspberry+pi+4PDF link annotation
    • 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_off0000e054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE054 17640 bytes
SHA-256: 119de64f044e54b38ad81145e9bfa2e71a6b49e4f14b09dec1f658e4f0fe76e7
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001266e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266E 10668 bytes
SHA-256: 0f0937e66bc7955f97e4a79bfc7a83b23978a3d1887c83dd4e70c3e1a6645596