Malicious PDF — malware analysis report

Static analysis result for SHA-256 054a27aec2a62820…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 13:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 797f3c17e613154fd82316c4ef14aaa6 SHA-1: a20ad7f5a168ac6bac55012af51d5fc655f5fbd9 SHA-256: 054a27aec2a62820c21f8b9613fbe3dc993fb713459ef7f13675f04d4b4bc0d5
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it's a link farm on disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious content, likely through a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd76c0fe32---83774026163.pdf In PDF document text
    • http://web5gstore.com/Files/files/miverutewijamikojezase.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/66290711733.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/63383142897.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/75888379364.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/83905974508.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/84955733452.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/desepekep.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/numuxisomakerexe.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/72683694019.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/rikomofugegowaxowukosu.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/bifesixulikudowofepul.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/27187308673.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1632083602.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109030820066884.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/nizanarofa.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/6342858370.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/vepukiserob.pdfIn PDF document text
    • http://apcmagon.com/userfiles/serodiriwagibome.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q69ht41q34cdpbfgq5qfcchei5/12455358101.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/49412251622.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/jorumijuporox.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/77181977243.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/73886973836.pdfIn PDF document text
    • http://fzxszpt.com/np/upfile/file/79743602396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+the+best+medic+gun+in+battlefield+1PDF 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_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD28 10988 bytes
SHA-256: e6ddb5d326dbb392696836ab21b330e0aad9a305df65530694b5d531456fe854
font_02_sfnt_off0000e64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64E 16160 bytes
SHA-256: c5a6a575652dac8a5a0032443fb394cf9a70ff9acdf4bf8bae650efcf005f8de