Malicious PDF — malware analysis report

Static analysis result for SHA-256 587ba62b99616172…

MALICIOUS

PDF

73.1 KB Created: 2021-09-22 20:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e7cb121771adbfa8baea8408e9c4bbd SHA-1: fb3831c4bd77015681d025aed898d69ffc412880 SHA-256: 587ba62b9961617297e8098409d5624807dcfd60818c649f67d1d22116733788
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the presence of external URIs suggests an attempt to redirect the user to potentially harmful content. While no scripts were explicitly extracted, the structure and heuristic firings point towards a malicious document designed to lead users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://drafthe.ru/uplcv?utm_term=how+to+open+aac+files+in+android PDF link annotation
    • http://pierrevillers.fr/mairie_files/file/ruzapupafi.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/14018010104.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/takigebawetorubulodalokeb.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/61072586819.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161361c3629cfb---41593496788.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/310292491.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/zatiluzusagalerizetoke.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/4498293678.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/nulogevobenipomaduviva.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/tukamolevetamexuzap.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/31715268912.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/sasuwigelaj.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/16219415344.pdfIn PDF document text
    • http://terminsk.by/pics/files/16073663738.pdfIn PDF document text
    • http://immopolignano.lu/images/62592457335.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/41875494212.pdfIn PDF document text
    • https://langumeistras.lt/i/File/jagaginit.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210907_145342.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/zizuvaru.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ktvttc8fm78pjndhlkmmibo5f3/65805102169.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/dixobezezewadusigi.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gividuwajit.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/menubin.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/vokuz.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zabikapusupaxa.pdfIn PDF document text
    • https://tele-video.ru/upload/files/votegulisafaba.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_off0000b99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99D 16920 bytes
SHA-256: b0cb014f7e6977a21db2fef120fc4a52c4fd1e0d448b8ab79f38536cf6ec17bc
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 10688 bytes
SHA-256: 4e1dd88bcb030b9620de4d8d4e95e71d03aa78e729c5f67837d0a849359a8869
font_02_sfnt_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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