Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51cc29ab89070d0…

MALICIOUS

PDF

85.5 KB Created: 2021-09-17 18:10:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9be48e29984c9b3abfb6f624594bbfa1 SHA-1: 604e8e496bfd8ae7412313eb18161284b6b0c3a9 SHA-256: f51cc29ab89070d0fa143432017b152df353138b12013b095f3d5d83626acbf4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score indicate a malicious intent to redirect users to potentially harmful sites. The ClamAV detection confirms this assessment, identifying it as a phishing-related trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=thoptv+apk+live PDF link annotation
    • http://akvatoria.by/UserFiles/files/govulojokegaxemexefuji.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/13935339482.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/xabimedo.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/9597491115.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/legex.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/91537594500.pdfIn PDF document text
    • http://ibb-online.ru/f/file/31095438098.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/48199298646.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/zajenibonazezuke.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/69838994070.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/bekisusomiwuxolero.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/5f0037ae963462de68e70e9671d23c96/visimisisatikobubesi.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/72389747056.pdfIn PDF document text
    • https://telorgabus.com/contents/files/90224841519.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/rofitepuvusosuwi.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/82487784142.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/59606074085.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/fopesebufisowapulebuwove.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/36112762790.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16308195521343040538.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/udcos8ckjdgpj90p4ouhotmvoc/safunotagosenejodalaret.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/91962602987.pdfIn PDF document text
    • https://jnnjhansi.com/userfiles/file/pisubevotivam.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/bakegef.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/zetisobaga.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 17844 bytes
SHA-256: 68363c80777a5a18eab938369c1a8f6722c1b0bc47e3461c9dd87b2b315b9de7
font_01_sfnt_off000119df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F6 10096 bytes
SHA-256: c9ac6b15cff6c00253d583e5dcb62cef9da4ae5cafb12efc4c8821cf98bfc109