Malicious PDF — malware analysis report

Static analysis result for SHA-256 0213f9a8dd139f7c…

MALICIOUS

PDF

70.8 KB Created: 2021-09-28 10:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5413ec5a2b2828a24d642f2fb7f4176f SHA-1: fdbf5dd4ef03955acb164c7d77df082dce22fdf4 SHA-256: 0213f9a8dd139f7c150b5f6c03515d6268653f0efce93926e7601df1397d2176
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded URLs, many of which point to disposable domains or link farms, indicating a likely phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://nomylo.ru/uplcv?utm_term=panda+song+wiz+khalifa PDF link annotation
    • http://lasantitosrestaurant.com/userfiles/file/gasojupixalewexijijun.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/40339393630.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/gopupumizuviraxujirilexi.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/47881188252.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/61924547278.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/91003115142.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/65364393844.pdfIn PDF document text
    • http://straub-online.ch/userfiles/files/52894708091.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/57195600348.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/27960861002.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/sugap.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210912041108.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/zixeroda.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/94330053237.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/54309092499.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/ragoguwuwisix.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210918094600.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/vufexiwodifatubuvud.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613433526b124---8960171690.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/80070468536.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/97356587186.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/66704078451.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/72611297047.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_off0000af89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF89 17988 bytes
SHA-256: e98bc2a1c6dbd0a71d94306b24df216ab2c925abe9a02fad241016f6760bee50
font_01_sfnt_off0000de5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF674 10544 bytes
SHA-256: 37dd8adb4a13f56ddf1c402270ed654e58c17f0ea91567af7d4a652bc6982e09

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