Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc9b2cb11162478…

MALICIOUS

PDF

72.9 KB Created: 2021-09-24 23:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fdf5220010b8f85ab32ce9d07b388868 SHA-1: 2dd44506792b1d011a4b657edd24338f472fce37 SHA-256: 8bc9b2cb11162478bbe6ff448f006942999cd086dba1c22272e43dc215e3ed76
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the suspicious nature of the links. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially malicious websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://infrive.ru/uplcv?utm_term=redmi+note+10+5g+vs+note+10+pro PDF link annotation
    • https://gcr.goldcrownresort.com/magazine_files/files/84942216588.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/7602976082.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/xaxavonosuranusakapok.pdfIn PDF document text
    • http://saint-party.com/media/file/6074651285.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/faxoxubesusa.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/givurerasu.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/tigenu.pdfIn PDF document text
    • http://smm-mm.com/uploads/news_file/22227511427.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/fuwopomeketogesasov.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/38801002511.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/nawina.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/biluna.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ab49c8ed---62602013281.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/nomimofajude.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vekidigupibuxalu.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/pofeguvixenawire.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210916053431.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/51962008624.pdfIn PDF document text
    • https://christschoolblr.in/userfiles/file/vokowapojikusozabut.pdfIn PDF document text
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/fisetimasirujoto.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_off0000b1f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA03 19496 bytes
SHA-256: a21a5e8d6ba0fdb02a8e3894a1577285a6c956e48557daa00f2f30d199cb46b7
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 10948 bytes
SHA-256: 64d7ba0e0f4304b8e2f2f3c8f1d2603b8f34c10f4c3d4496f0d09edd544260d9

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