Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0081f701195469e…

MALICIOUS

PDF

78.0 KB Created: 2021-09-13 00:28:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f069da0f618926a929c4e63389de992a SHA-1: 4c33ebbca07a2fe4c971dfd17efd4aa794627443 SHA-256: f0081f701195469e0c5c728e364ac5a97a6c3a57a7b2ed15d9beac5b328bc131
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple links, with one critical heuristic identifying it as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary redirector URL leads to a link farm hosting numerous other PDF files, suggesting a campaign to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=free+to+air+tv+app+for+android In PDF document text
    • https://profm.hu/files/file/zivowaxofunot.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/mufulox.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/46220820480.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4172652a12aac225cc9ada80e9660e60/91452393079.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/munoserifurunapurenez.pdfIn PDF document text
    • https://cargotavio.ru/files/file/kararewa.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210911213814350939.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/76274522923.pdfIn PDF document text
    • https://petikdaun.com/contents/files/60699511332.pdfIn PDF document text
    • http://sireny.net/share/files/zegebabefinozi.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/dejoguwenef.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911181918285801jtiw6i.pdfIn PDF document text
    • http://partnercable.hu/files/29618184814.pdfIn PDF document text
    • https://huanghecables.com/d/files/beligunobedezazegumeralu.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/54816528048.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/fapazukid.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/4816405758.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/93779382231.pdfIn PDF document text
    • http://naturalwonders.com/uploads/files/7269081145.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/diwefubulozoxufuzewol.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/giwupajez.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/karugijapirubob.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/98559527609.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_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 18564 bytes
SHA-256: b4f4b9e6333c936c43211210c74370dd5c9ea39b1f0df4460e98ea28924a2c10
font_01_sfnt_off0000fab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB9 10320 bytes
SHA-256: f85d336f224cb8483187e4e5ff5b2c592cb97269fb2d4a90682a607786eac576
font_02_sfnt_off00011217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1