Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6361866d103457…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 08:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 593abec8e8e332f0221768ca8bc2728a SHA-1: 3c30dfdd21bea7e1a76fd20e4c283823d5077c85 SHA-256: df6361866d103457922a87d4fbbed099e59515327a1175509f251766abca9970
74 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests the document is designed as a link farm, likely for phishing or distributing further malware. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://huntic.ru/uplcv?utm_term=clash+royale+mod+apk+private+server PDF link annotation
    • http://darec.sk/files/files/56110308972.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/53654080239.pdfIn PDF document text
    • http://signauction.net/userfiles/file/37229579963.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/15695269667.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/39090336654.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/71015691585.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/lipudaziralasababesijib.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/23638376659.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/xapekikexegoradudiseka.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/d17fc7f5fc8184ad0a62de21f032bd00/15786920922.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/76293373169.pdfIn PDF document text
    • https://latrinquette.com/upload/editor/file/mosujegobudetomakov.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/dewetog.pdfIn PDF document text
    • https://journalofcritique.com/ckdosyalari/upload/files/lajog.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/muwuzodotesiropim.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/30761634825.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/xuwerutinedibowugabokoriz.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/78219098956.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/selob.pdfIn PDF document text
    • http://gojjang.com/uploads/files/kujolatezolinatojalezoto.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/falanijomosejizum.pdfIn PDF document text
    • https://dacola.com/upload/files/xokizowutibefarezawu.pdfIn PDF document text
    • http://djpress.pl/Image/files/turenunuveliwavuworuto.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 20356 bytes
SHA-256: 4f1283636d2c8055645e2cabe04b05b7271e6390c2dd5762081bac45b6bac74a
font_02_sfnt_off000110de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DE 16584 bytes
SHA-256: f58e87d64f4db1f783304b64c10c309b8e6281fa34a343e1cebbae4e8af61d3b
font_03_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 10856 bytes
SHA-256: 5a321ef5a6c0cc058c9d812a6bc63dcf6964e14cb061072545bcf1830211c721

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