Malicious PDF — malware analysis report

Static analysis result for SHA-256 0307ae4976e665cc…

MALICIOUS

PDF

81.0 KB Created: 2021-09-09 22:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d35b7e4fc24691348313807c2d1977f SHA-1: 05ec5291b3c5c1a280466c31ae3446ed0726de00 SHA-256: 0307ae4976e665ccfd789bff3c44181f70548bfc6afce2ca6afb5ecabbce11ac
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.001 PowerShell

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing infrastructure. Crucially, the document employs a 'Clipboard command execution lure,' instructing the user to copy and paste content into a shell, a common technique to trick users into running malicious commands, likely to download and execute a secondary payload. While no scripts were directly extracted, the nature of the lure and the ML detection suggest a sophisticated phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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
  • 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://wonwon.taipei/photo/file/kokugodonikiwexomen.pdf In PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210908_E051F99323A114E2.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/67265245129.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/podixefavexakibo.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/nazumobafugosuwozodoto.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc2a6a786---nupusigujuvevowativo.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/6497650446.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/8ce4f395e05d6a2f6cca7ce112b45983.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/dimerijosew.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/wiroguwe.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/povofejij.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/zuliworetov.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/83393854774.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/padukini.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77d3242a1---60811636161.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/26467280272.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/3091569182.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/lazewas.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/74689989815.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/75443477243.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/77175448529.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/bisigupesuvalebefamidi.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/tusasonadusevawug.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/34126785241.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/21861739866.pdfIn PDF document text
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210906225226.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/53588175536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+talkback+offPDF 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_off0000db1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10380 bytes
SHA-256: 52192904bf843b23a475583bf73e01b6ac45363229271974ad9aee51e2769b1f
font_02_sfnt_off00010abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABC 16624 bytes
SHA-256: ddfa4e0a41a704e885cbed8ee9a797f0ed748598193d29e9e64f6058d530453c

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