Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf0f0846ad99eeb8…

MALICIOUS

PDF

71.8 KB Created: 2021-09-14 00:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39946c74261bb201d5f9e93b24fdb2d0 SHA-1: b69002b1269b12d99d8188ee5b372b0444b63e49 SHA-256: cf0f0846ad99eeb850c29e9353617923a571287414c1e027d62f45ddc9a14f2b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, indicating it is designed to lead the user to malicious content or downloads. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic strongly suggests the document instructs the user to copy and paste commands into a shell, a common technique for executing second-stage malware. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://cructi.ru/uplcv?utm_term=engineering+mechanics+hibbeler+solution+manual+pdf PDF link annotation
    • https://ferdavagnar.is/images/fck/file/satutatolele.pdfIn PDF document text
    • https://lombardpruszkow.pl/local/userfiles/file/dirokufizopavasatute.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/sugaramodivozanejumuvagi.pdfIn PDF document text
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/danin.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/59930982422.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/fuxinizilotekesezanefix.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/veduwarog.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4623233e4---55219940116.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/liniwofezexivok.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/77491738889.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/luzuvalow.pdfIn PDF document text
    • http://domosplast.hu/files/file/gapakigitapa.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/purizizizu.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/15844327443.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210912_110031.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/79631894170.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/sujobosuwomuj.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/jawofezatagotav.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xibofi.pdfIn PDF document text
    • https://lesrimaudieres.com/images/uploads/file/50024242087.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210903224916.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/14797277174.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/67628239243.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/afa8d5ed6ab6cc6996d6e5f5bbe1d714/69844728338.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_off0000b677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB677 11288 bytes
SHA-256: a84462cee0d0d6931b9c11205678e6d85f12484a62c9cbe855d4c785d0775646
font_01_sfnt_off0000d053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD053 15848 bytes
SHA-256: 759069f4661f35d069f10f11b50cf54065af45f7a8fa6ae286ab6be38f333f3a
font_02_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1