Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8bf4f4b68e3512…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 04:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6309436efea7f5c0ce5426f20bf7a56 SHA-1: ec2df079dafeeeb5a3d10515792fbd0a68d94ff0 SHA-256: ce8bf4f4b68e3512521dea31d14d3cb3f280125d84825a98ffc7bb66c29dcbb1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it is a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL distribution suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lmcmanager.com/ckfinder/userfiles/files/xanidelizuzikuwoputadupi.pdf In PDF document text
    • https://sakkestadbil.no/userfiles/file/13082553968.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/laduzoxinufoparor.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/74532788674.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/gulewamoda.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/54132663202.pdfIn PDF document text
    • http://scantech3d.com/files/81242113407.pdfIn PDF document text
    • http://yljczl.com/uploadfile/2021090214482559.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/50503290823.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/sazudirufutupizagijo.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021090515374990.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/1671140996.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/podakasikavadefibebemu.pdfIn PDF document text
    • http://takramaipai.com/mypicture/file/nivugorawitowibixadamu.pdfIn PDF document text
    • https://j26clean.com/upload/files/7567870044.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/9632740894.pdfIn PDF document text
    • http://irths.com/upload_files/files/kegijutisurolagozifolixes.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/sidafisafonubakazofax.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/23648349527.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/44353382562.pdfIn PDF document text
    • https://tebra.si/userfiles/file/82654062147.pdfIn PDF document text
    • http://waypl.pl/upload/File/57741516173.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/peximurabilifikamazakeriw.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/muvazolapuxaxusakaxuna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dragon+ball+origins+2+romPDF 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_off0000dc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7A 20368 bytes
SHA-256: 6d8580939abafb10eda0ebdecc2fb8f02978d1b87b7df6ac04133ab596b8c82b
font_01_sfnt_off00011162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11162 10484 bytes
SHA-256: ce0180db14233ebaeedfbe7043a098690d5ac29a846e43ef845dcb99c81dfbe6
font_02_sfnt_off0001291e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1291E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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