Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacccc9ac41fb5f1…

MALICIOUS

PDF

76.2 KB Created: 2021-09-12 05:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e42d5d868b8d16bd0d77a9659f6f5f2d SHA-1: 1a904d0a5b6334f3e811bda033a98f1811d24b7c SHA-256: dacccc9ac41fb5f16ae74d54a7fd4bb0c2dc205f2cdfc71b741a9af74d6925ec
206 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, some of which are hosted on disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy content for execution in a shell, a common technique for initiating further malicious activity. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://queure.ru/uplcv?utm_term=slide+to+unlock+apk PDF link annotation
    • http://hkxhjfc.ltd/uploads/files/20210907051259.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/20999582677.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/roranebexuzejuwomokek.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/dativogojejinazitefuke.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/47441049217.pdfIn PDF document text
    • http://ebus.cn/up_file/file/xudibewiwexaxuvajapowele.pdfIn PDF document text
    • http://geasit.it/userfiles/files/69170240869.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/44817523665.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/fhlgr865qa5ulkuc0d2i49mlso/jozumararilenufezinat.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/tomijak.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/nomenavotenipurozoxepifez.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/digewu.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210909_064905.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/6257618059.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/78821451428.pdfIn PDF document text
    • https://proia.bg/userfiles/file/61531396901.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb1f5aa8c6---71232262276.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/84983535170.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/nififitu.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/duxiloxadozonanabuvelapek.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613d234487d2a.pdfIn PDF document text
    • http://vaynhe.com/upload/files/28713504558.pdfIn PDF document text
    • http://happy-land.hu/editor_up/79066404138.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_off0000c0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DA 19292 bytes
SHA-256: 4ec7fc8d058af83e27739cf78ba08fe0675affb18807eb518504d34cec00ac3a
font_01_sfnt_off0000f35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B75 10504 bytes
SHA-256: cc1214ed1a959c1f1917a46594fea7d2cd1e305e7f679581cce37798e6075144