Malicious PDF — malware analysis report

Static analysis result for SHA-256 22cef385f4ed4277…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 15:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c8431b7a039596ab53dca81f8404e46 SHA-1: cd9b200180dfe11c3055eeb598764c8c84b0c314 SHA-256: 22cef385f4ed42775df1409dee49aa04537ea833489d2c8519181c9cc142fc95
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier and contains numerous external URIs, many pointing to disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or malware distribution by redirecting users to malicious sites. No scripts were extracted, but the structure suggests a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=facetime+call+to+android+phone PDF link annotation
    • http://rucodelniza.ru/userfiles/file/xivij.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/9604027680.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/fanafarojaxezal.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/78685870285.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/27469673076.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/pamodorek.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16145913ac09c5---zenuleju.pdfIn PDF document text
    • https://thehouseproduction.net/file/pitosexufutezexupuder.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/lifosibitupobezavepabiti.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/witomadunodere.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/gemefonexufewumarux.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/24693752371.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/riwirazujerami.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/gulenigubog.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/pugonebotow.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///464524749.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/buraluzevudepuwen.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jaloxuforerexonajale.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/11233551449.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/92479158794.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/xezesedozazukojorof.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/vozuniwibijafuzi.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_off0000e24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24E 17916 bytes
SHA-256: ff5f124e38c0f1e53cd77e0260654e81404cdd48bfcb2de786c5311175cd7199
font_01_sfnt_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 10588 bytes
SHA-256: d9fa67b6b8d18e26025ec44d14d8786e7f4984217ba004240dd403441f34a91f
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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