Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c22f1e2d6852f2…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 14:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 91a2e23d202e589d2a8e5b09d151481d SHA-1: d5c920e6119685378886a5e85c2d7708d751bea0 SHA-256: 98c22f1e2d6852f2d1608fe0022b9e39fc3cc2ad1e755f7ef08ad0e16e8818fa
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous external URIs suggest a link farm designed to redirect users to potentially malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://yourtruck.be/upload/ckeditor/file/nuxosigediw.pdf In PDF document text
    • http://dsfly.com/uploads/files/68405564468.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109141453531967.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/76627492468.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/25184174052.pdfIn PDF document text
    • https://gangnampools.com/contents/files/woligubuvenewuxapemojom.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/31281625367.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/35739976016.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/tixitutusuzedizuwozuguf.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/kigut.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/noniwax.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/xazed.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/wanotajevaruvapawo.pdfIn PDF document text
    • http://safaraval.com/basefile/safaravalcom/files/tositepigosijupimamosoj.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/11ae2848702581fabecef197942fe596/mitesobetizadapudin.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/45374089121.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8984719ac---87223165158.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/2747393331.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/87556687032.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/vasajonog.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/78081774224.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/ximavofukaloji.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/74591960328.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/jekimebodojezube.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/vexogutak.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/67739039510.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/94117230957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dragon+ball+super+17PDF 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_off0000b39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB39B 18480 bytes
SHA-256: 8b41b0cbb09719f7343f9cb7b1f653148e7b8160c5082f086dddc4268e52dd75
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 10580 bytes
SHA-256: 197c7b11ea8dde8eb00fdaa5590a19dab5aae1cd8d98eb9f84f96061fa708c71