Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1099638ecba2b1…

MALICIOUS

PDF

64.6 KB Created: 2020-11-07 20:59:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 2fd645bd2f15a9c344794506ec306542 SHA-1: 1c3caeb99a268b67dc83197a706500f26c7417ce SHA-256: da1099638ecba2b1ef08022b24fe0d6d41e415a2b6ddab5b3fcf42911ea3d4a2
76 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains an embedded URL that points to a suspicious domain, identified by the PDF_URI heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains text that appears to be a lure, directing the user to the malicious URL, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://trafffi.ru/123?keyword=formula+for+curl+of+vector+field PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365549/normal_5f8c12f345f9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/43In macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fb5d5b5-bd23-44c8-ac6b-5323f7869626/lorimemikeno.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/zunaduxa/arihant_general_knowledge_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/campbell_biology_second_canadian_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/luresimosip/defexawifajukope.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/letewegeredesozoxiguvopev.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/24763604275.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/how_to_polish_boots_kiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/66570720622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2355a10f-2d8a-4275-952d-810019840215/xinuvatuvokiginexuduzu.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/choices_stories_you_play_hack_apk.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://scripts.sil.org/OFLIn 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_off00009f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F27 5004 bytes
SHA-256: 9ea92b35393ce7960e2c7c5316711e2f223c7a2f259284179bd11adcc90e8b1b
font_01_sfnt_off0000b01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01E 13988 bytes
SHA-256: 805e9b326c55bd66e3c19ee594e284f77e70299c94a1a28e7ebcc0204fe08d59
font_02_sfnt_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 16784 bytes
SHA-256: f4e12aa4ff5608fbb85e3308c76b74b8e2ffcd7f17f4400b9def36f33df0b522

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