Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a23e27e68dc2f8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 01:36:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2f7f5c082b83047c2d23707c29beb667 SHA-1: 6a6b1dfc9668f755539e2bc46e7cc22ca43903ac SHA-256: 98a23e27e68dc2f89aefe5b71dbdab7684b41770758dcb197f3cfec217d736d5
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=android+bug+report+reader PDF link annotation
    • http://w3-japan.com/js/upload/files/mutogosixovokitabimiki.pdfIn PDF document text
    • http://tatooazh.ru/files/files/pufexoxonogivutafadaxewi.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/zopuwagivixera.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/36757823755.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/kitowim.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xamodazazoki.pdfIn PDF document text
    • http://benrassam.com/uploads/files/4050955236.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/dufumepakuputekazige.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/vowugafugorikubonufa.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/witutovopigelisam.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210902_020840_173.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/bazubetubolul.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/xupejobisogonopeg.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/50469113299.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/42413074806.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/vuposinebiti.pdfIn PDF document text
    • https://http/www.ma-mairie.com/ckfinder/userfiles/google.com/files/mejixomoxogexat.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/wanodesagufinet.pdfIn PDF document text
    • http://52963566.com/upload/file/202109032233502924.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/pujulosifoxomesex.pdfIn PDF document text
    • https://prtl.pl/userfiles/file/75966437175.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/meraterivep.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/topenedok.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090622554173499.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_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10572 bytes
SHA-256: 0e72babfb27acc3f9ef448ad0ebc1d94b7691d515eaf5bc81724f66ed8275f17
font_01_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 18920 bytes
SHA-256: ca95efa72ff25b6d85c7332a90b2a9083431f1977c78893b5f23e8077b205b06

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