Malicious PDF — malware analysis report

Static analysis result for SHA-256 2407b4eb44f412fd…

MALICIOUS

PDF

72.3 KB Created: 2021-09-16 17:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: baffa5f3f528b278a7ccdb5cf2408933 SHA-1: 4d0a2fd2c637699d92f00a54b67f0289ad395457 SHA-256: 2407b4eb44f412fd43fd5e232e66364f40882b7ee6fb5eb5cbb2fb2e1fbf72cd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier strongly supports this assessment. Although no scripts were extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://tylbm.com/Upload/ckeditor/files/kidigutiwezelulis.pdf In PDF document text
    • http://www.niceresidence.net/image/upload/File/12645996312.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/luwubiwavegomu.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210915_62801F2C9E306489.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/boxapa.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/e8f786709d3470399308a385b143f5b5/19843320406.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/45090680082.pdfIn PDF document text
    • http://wawa757.com/uploads/files/64639298378.pdfIn PDF document text
    • https://termofriz.rs/files/5121049915.pdfIn PDF document text
    • https://scmsgroup.org/ckfinder/userfiles/files/sekevujanibilise.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613538c1be99d---zifufakaterexupadir.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/nedokerurepaje.pdfIn PDF document text
    • http://texmet.pl/userimages/file/rewedefo.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/447659904613750bbf175d.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/17339164332.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/sifine.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/76654686009.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/71577154572.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631534576.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/vureduf.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/29979491348.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/97925684957.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/refit.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/vatinukitemavorapurokeneb.pdfIn PDF document text
    • https://armenia4d.com/contents/files/90212858700.pdfIn PDF document text
    • http://clickvay.com/upload/files/dojigewininoropipawiwuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mobile+phone+operating+systemPDF 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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 10948 bytes
SHA-256: 4f8e861483a9f269afb85860df67950a1ee87b21851f0a3059f05620ecb4c9d8
font_01_sfnt_off0000d263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD263 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA75 15756 bytes
SHA-256: 50ee8fb46c95b4ec1aefab1c7ea946bc06bb3f8d5da4cf9f7f4e4bd398417e8a