Malicious PDF — malware analysis report

Static analysis result for SHA-256 218cc9a7950bc5ed…

MALICIOUS

PDF

70.3 KB Created: 2021-09-24 15:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6230802a7599a3e94bbcd827cb34a77f SHA-1: 1d40bb18351def1a084bf9fdcfbea11096164c1c SHA-256: 218cc9a7950bc5ed5d2d34feac98e5c01672cc47a645543d79c1fb49fea707f7
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which are part of a link farm. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as search results for free movie websites to entice users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://theseadiaries.com/ckfinder/userfiles/files/kewajubiruwabokodiwowexi.pdf In PDF document text
    • http://mps-india.com/userfiles/files/45775633460.pdfIn PDF document text
    • https://termoformat.md/img/files/kobufomofenoboziz.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/41063050619.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210911_1D42670ED71A1739.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/kogora.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/3394187971.pdfIn PDF document text
    • https://parkerboat.hu/js/ckfinder/userfiles/files/masewijatonuwalatixevuli.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090516062941.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16309867722989.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/53493663892.pdfIn PDF document text
    • https://panama4d.com/contents/files/bapunebulapinuxorodipopeg.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/pederurubawefakadirotivi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/80997990591.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/pifiwirifito.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/pefekiwopov.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/bedojosisogawa.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/43696638627.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/nutegax.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/48404965285.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/45596993145.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/95778739760.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614322fcbd590---30148447789.pdfIn PDF document text
    • https://thomsonindia.com/userfiles/files/71209550655.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bipuwopuzukugufu.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/69952438272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=korean+movies+online+free+websitePDF 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_off0000b415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC27 15268 bytes
SHA-256: ac2dc8324ca8107f56b967f5068ffaca31e1288b46049f3b918c923e8744c7f0
font_02_sfnt_off0000f274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF274 10656 bytes
SHA-256: c6ee1857ea552d9c69906d03f23c06bb1e73f48b05a482603092b349523c4c22