Malicious PDF — malware analysis report

Static analysis result for SHA-256 4734070916ea33ac…

MALICIOUS

PDF

80.2 KB Created: 2021-09-17 03:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b35cce2ea58c2677b1f899a49a374a3a SHA-1: e0a8c9a56b28abe58965bcdd252332d3348dd11c SHA-256: 4734070916ea33acc1284c3bbe28173f6e6be0504092ece9be8625554ae1022c
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The presence of a URL with a 'utm_term' parameter suggesting a 'minecraft guide to survival pdf' indicates a lure to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://crewmak.ru/uplcv?utm_term=minecraft+guide+to+survival+pdf PDF link annotation
    • http://idcla.net/upload/files/42456264703.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/21909708345.pdfIn PDF document text
    • http://neboskreb-irk.ru/uploads/userfiles/files/noxilim.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210913181904.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/repupurenur.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/semujezogirazakezonogofit.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/0dcaab797ca16751c2c11178003d63a0/zatudefinexofeg.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/zenamozalavaw.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/78525689745.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090506091073499.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/vanomekabenabifogi.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/74382170002.pdfIn PDF document text
    • https://ambalatender.com/upload/files/99761783103.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/nesulidogogobovutakuzeso.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/saliv.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/jalido.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/janutipademipeg.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/tefede.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c995335da7---fevofizalediwupov.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/55653777569.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/ferogozijoveb.pdfIn PDF document text
    • https://buka.ru/sadm_files/90337160474.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/zosadopapup.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_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 10952 bytes
SHA-256: e89477bc83393f5ee83443a9eef0da100e20c23275acab4d23a2e5c79c101f5c
font_02_sfnt_off000105da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DA 17580 bytes
SHA-256: 4f2b53f903dc6b24994e0235baf42235ac67bff0a7c4fe967cb1051fd33405da

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