Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac363247a2c124b…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 14:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bef847cc7a9453cf8b2a8516402f4ab SHA-1: 0f46ee96c4251a4f5809cc22fb71f978698548b9 SHA-256: cac363247a2c124b952ecd3a6051fa01543febf0088509e592a826153bf7828a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://juniorclublivorno.com/sitonews/images_upload/files/jakamexi.pdf In PDF document text
    • http://realfootball.gr/userfiles/file/42504202982.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/12870114527.pdfIn PDF document text
    • http://orderkai.com/uploads/files/merevolelireboxa.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/joresowovomevajigosoro.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/putojapizojuwawojep.pdfIn PDF document text
    • http://metabolit.ru/files/file/vikawumo.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/612f2a1f41b8d.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/zijawipavavi.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/23050311246.pdfIn PDF document text
    • https://hse.tw/upload/file/muketonisawuriliku.pdfIn PDF document text
    • http://keacg.com/upload/files/13040123394.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/giwazitawatatokesuw.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/wogudumoxapuxa.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/5467580853.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupum.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/bogofilupexufodiz.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/sefepevutoreramuf.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/mokijufexojawewilogowo.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/todazikug.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/2475909204.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/gikinunutedulazotubipit.pdfIn PDF document text
    • http://tecresconsolidamentorestauro.it/fck_data/file/12963901407.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/64578203023.pdfIn PDF document text
    • http://brain-sh.tw/upload/file/82945476242.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=kimetsu+no+yaiba+full+movie+streamPDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC855 16068 bytes
SHA-256: 1ffd016c3b9bf56e5c914bb4c1cbd8e80b73d340b4d07b1e4dd9fa9ec1c40f29
font_02_sfnt_off0000f0f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F0 10788 bytes
SHA-256: fdc0f648d73d6b1546707031bbb249877edbc90230de9b67884750a8e52bdd59