Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd05a5691b05f615…

MALICIOUS

PDF

74.5 KB Created: 2021-09-11 13:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3a30d0508290eada79fb95fb356b68f SHA-1: 8247333d01ff179d4aadac2c1c4d7e4cfd902b6c SHA-256: bd05a5691b05f615841c656330d713866249f9cd94912ff6ca3dd28f61140ab3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, and one heuristic specifically flags it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it is used to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://royalwedding.jp/images/blog/file/tanurural.pdf In PDF document text
    • http://copy2d.com/ftp/image/file/wudubunoxiduzamidipuga.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/371309758.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/6799310023.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/rupifumimemuxakomaxumen.pdfIn PDF document text
    • http://surestegc.org/documentos/file/lobadukofozitosu.pdfIn PDF document text
    • http://yoron.net/up/files/xumugunegirobelules.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/12074399868.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/jubidosibebuw.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/zudadusimavedetaw.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/92256334937.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2058bf9c6b4b67c3d71b90cf0e61f451/wedegukaxes.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/79729472133.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/naxotigegizuwat.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3155800c3---fukapepu.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/71324406220.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/pakakavawil.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/kedujevusasi.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/kevowumar.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/fikojetibug.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/52597813488.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/dirofexegubawerofe.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/vebozigedidopega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=life+on+top+tv+series+streamingPDF 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_off0000bfaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAA 10680 bytes
SHA-256: 2a192005edd9594dcacabe9390089ac0be3b62c0478c1f3fb92dc7e4460134d3
font_01_sfnt_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF046 17172 bytes
SHA-256: f16d75f6023daaa7dffe1bef9ec329ad20a06712ef9b13a666c1a6e1a269917f