Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaef2b87f1211dd…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 02:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1fb2f668f871285957e1c713c5384b34 SHA-1: 8cf7af22aad4d88564708ca55c51ac4ac44b2433 SHA-256: 6eaef2b87f1211ddb77386339e803428a8050328de739e3f481df19f469819d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of numerous external links, many pointing to disposable domains, suggests a link farm or SEO abuse tactic. While no scripts were extracted, the overall structure and heuristic firings strongly suggest a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://afma.pt/site/upload/file/13992970808.pdf In PDF document text
    • http://fteq.ru/files/file/41204849519.pdfIn PDF document text
    • http://strandedtattoo.com/file/bidizazamir.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/28204020459.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/megasikegirutikorun.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/98965123874.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/muvibivubutalegafag.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/gejaxisu.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12958809821.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tisomotibivagaxewikosofir.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/73143931540.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/gulowajekofekul.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9938868b05c72d7000ff58a1d8cbf32b/vokipalixelagosi.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/kegoxos.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/luvonozovur.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/71977466738.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/88394339362.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/rozikajidigaroge.pdfIn PDF document text
    • http://fanta-life.com/userfiles/file/nisobixelusowenegajetil.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/jipotazewa.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gegega.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/pelij.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/xitujoto.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/34558763954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=wrecked+mod+apkPDF 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://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_off0000c275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC275 10252 bytes
SHA-256: 2874228a2247f8fdee95cfabeda77f50e4ab69380da3413d099e0b4a278e84b3
font_01_sfnt_off0000d97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97A 17720 bytes
SHA-256: 194bcbd524f1dd81ef4ae9fdd80cb264abaa6e1433598d1d5a681c6354a5eddc
font_02_sfnt_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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