Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef02b867177546d…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 19:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 39530ea80e5c59c4a5badd0f6ade96fc SHA-1: a4d00d0142eeab5c54a60aa17d9022a7436db4bd SHA-256: fef02b867177546ddaccf71afbad237e46ab807d0f51067e70b6976b1a448451
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://kramnyca.info/img/upload/editor/file/12922611555.pdf In PDF document text
    • http://achilleferolla.it/userfiles/files/65671678572.pdfIn PDF document text
    • http://topmebli.com/content/xuploadimages/file/jatebisivumagefabegon.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/jovotuzirapanavafubobimap.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/86760479523.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/zamogukadavuzuwexutobomem.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/19863496088.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/39046956077.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/vajejunapixivonaligoxo.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/626209132.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090218144066.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/61938701073.pdfIn PDF document text
    • https://kawanmto.info/contents/files/86584426907.pdfIn PDF document text
    • http://agecarekorea.com/ckupload/files/sumuselajeladifuwaremo.pdfIn PDF document text
    • https://harom.ro/files/file/4629475164.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/14381278756.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/ropetobagigo.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/34512680934.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337059a2b5c---54348063963.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/3c6a6f7c61af7477aaa5e2136991ab97/zikijewelafugunajusa.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/momanerijasapofono.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/27873887969.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/35539118173.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/49181873692.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=garud+puran+gujarati+pdfPDF 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_off0000b095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB095 10476 bytes
SHA-256: 6e3ce04837049c0af001f2b476c72c75590cd85c70e0ee75a88602b502ad9efc
font_01_sfnt_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 15904 bytes
SHA-256: c92034b85319c1c82ee6d05fd61bc4e61385c06397782f7e6182a433fcdcaf47
font_02_sfnt_off0000f06b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1