Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c2d94f5209dce7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 14:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b2289e090b73136e1ae913a1c168b57c SHA-1: 2d8424f5a8415330104c7a8192b5b19d6708737d SHA-256: 28c2d94f5209dce74f855d14cd4b42df0fc3689714366a306532ddfb2b3c78fb
226 Risk Score

Malware Insights

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

The PDF document exhibits multiple high-risk heuristics related to remote support lures, indicating a strong attempt to trick users into granting remote access. The presence of numerous external URIs, including those on disposable hosting, further supports a malicious intent. While no scripts were directly extracted, the overall pattern suggests the document is designed to facilitate unauthorized remote access, likely as a precursor to further compromise or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support code/control handoff high SE_REMOTE_SUPPORT_CODE_LURE
    Document asks the user to share a remote-support code, connection ID, or allow control in the context of remote-access software
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://philabc.ru/uplcv?utm_term=root+android+device+software PDF link annotation
    • http://davcpundri.com/css/file/38072739867.pdfIn PDF document text
    • https://adikmanis.com/contents/files/jatak.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/cfd14a6b67a4281530c71e511e8c9aa8/gowejusuwapitisezafut.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/53967763595.pdfIn PDF document text
    • https://plasy.com/uploads/file/fabizulafoburepo.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/majisexufotub.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/4211252105.pdfIn PDF document text
    • https://securitydm.com/slicice/file/nopafadob.pdfIn PDF document text
    • http://topstec.com/d/files/54726628537.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/favaketeriwuzu.pdfIn PDF document text
    • http://land89.com/ckupload/files/dogokog.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/bosagibigotojevi.pdfIn PDF document text
    • http://fourfoods.com/images/files/muxixowozexe.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/zeforod.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/viriraz.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/34782546028.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_off0000e173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE173 10620 bytes
SHA-256: 6f8b60736caa3633c1a927fa61c828188dddb83c449373bba7725232c851036b
font_01_sfnt_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 18488 bytes
SHA-256: 3063c90c1900e4f681abec07805617645517ac3ba409db8ff46db55b672063dd
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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