Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1872e60f60e1cd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 18:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0e599dba6ac3cacb99579651e608e33a SHA-1: dd4737b9672853f9ea730976d824da44571b5ee3 SHA-256: fa1872e60f60e1cd032fdc914197cc07ab01e06fc40155daa43dfea58890b55c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are structured to appear as download links or content delivery. The ML classifier strongly indicates maliciousness. The presence of 'utm_term=apk+for+mi+box' suggests a lure for Android applications, potentially leading to malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://nomylo.ru/uplcv?utm_term=apk+for+mi+box PDF link annotation
    • http://tokyoracing.hu/userfiles/file/lavufud.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/gugipibi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614677804dfb4---diretakolupibifoguju.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/30683542430.pdfIn PDF document text
    • http://regmac.net/userfiles/files/68231492059.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vivanosiz.pdfIn PDF document text
    • https://fond.ru/userfiles/file/zalibirawipujarixonewelu.pdfIn PDF document text
    • http://jadever.vn/Images_upload/files/20734981866.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/39335375950.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/15866869866.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/51653925328.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/11475948950.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/gekemipiruwikos.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/delinoxujufi.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/87144705190.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/60185032513.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/nubisavunobowasedofimo.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/91820291850.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adf3364c7a---60816197807.pdfIn PDF document text
    • http://pmke.cz/pictures/files/22144035121.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/57502150429.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/kosolumobekotevof.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_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 18816 bytes
SHA-256: 326cc2738787970cc53beb6d200542fe79398c5cbdcc5ccbb8a2d7ad89c16662
font_01_sfnt_off000108f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12109 10124 bytes
SHA-256: 795b149eadf8b8be20f09a8653bc218651ab467416264f46cee3a06eed8ea0df

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