Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04643f0f07553bd…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 05:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0101e20d3d857f711eda45c4f4e5c6e1 SHA-1: 3063c5c845770a87c55b3f73855834e9e9b13254 SHA-256: e04643f0f07553bd0fbb105c2cd6cf5f1a8d5ef1c8c845e9b4fc9ee16271e294
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains hosting other PDF files. This suggests the document is part of a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://inprovitbrasil.com/ckfinder/userfiles/files/fewukokufefirejej.pdf In PDF document text
    • https://sealand-pptc.com/userfiles/file/nadulabokujagotolufukoz.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/29047375661.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/74944521200.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/nujefofilurag.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407ab9977b1---kevotunilisiki.pdfIn PDF document text
    • http://tomekorea.com/userData/board/file/dejajudowan.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/49572639251.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/3cfc985a452b9aa5d0c6a93356763720/tavumusuzakuludozi.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/9704478910.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/75565077936.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/3392245734.pdfIn PDF document text
    • https://businesslife.com/content/files/74710775023.pdfIn PDF document text
    • https://uudanbury.life/files/file/rurixirowozawufuxe.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/12233292348.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/98945760485.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/51748409691.pdfIn PDF document text
    • http://houselandia.ru/files/xesatijebibid.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/gupavutebenozusarekaxapib.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/zipopedebavi.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/22689344196.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/zamizil.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/fosozitif.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/jenifodog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=browser+games+for+androidPDF 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_off0000b06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06D 10692 bytes
SHA-256: f160285c107c97622af16157ed154f76c2c1c60fb1e6ce55778ba2894508b2d8
font_01_sfnt_off0000c8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E4 16812 bytes
SHA-256: 298ba00898221a9d76a3aeb3fc819ae1eb2ae44dbc0a66a3e2401721af295b05

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