Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2898ab5cd2cba41…

MALICIOUS

PDF

82.9 KB Created: 2021-09-20 18:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba4578bd6e7fbb1d15f01ab8a8ac4014 SHA-1: 8f7039ac22ec38a68229cba4e16840e9b56aeebc SHA-256: b2898ab5cd2cba41ec4aa6b1b045c2fbaccc8a47348910bf5785f272635d0867
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with heuristics identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially harmful external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://irinaburmistrova.ru/files/50930994063.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3f144a84---jenexanadikezokavobu.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/kakunijinunozopuvizazu.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210909032507.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/31277184923.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/24211417351.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/kujokazagixofok.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/lunenubaxepisediratixoru.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/18256963.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/4197299881.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/wesutupuzafexedobukakine.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/luditikatoriwepiwapit.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/pakuxanogusom.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/76978448070.pdfIn PDF document text
    • http://bubb.cn/up_file/file/mowaverufe.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/8d270fdf423b32636aacf94b4f8c5d86/82765381721.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/70475123203.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/vamorola.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/wigenodoru.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/tafefuwof.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/77977465787.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/24770406659.pdfIn PDF document text
    • https://datenglagi.com/contents/files/43740103767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=android+gallery+photos+not+in+orderPDF 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_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 10764 bytes
SHA-256: f7f8e5c6686859371d026c24380ca05804e749f4d193ba7b64fa3adc7e00196a
font_01_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 18292 bytes
SHA-256: 2605a2aa388dd9571b760edf2b971857c4967d44a3ef5a3d9f6e0c102d01cbae