Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6536ecf531ae5ee…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 18:10:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9af6b18ed1df2284a94d1f59fc04d012 SHA-1: 8b3b8d288f71d5d4c868a63cc6781ab160fd1c3a SHA-256: e6536ecf531ae5eee1ec9cd5f7eecc43707507be2022a1e3db14d2315b361e5e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leinerpakgelatine.com/survey/userfiles/files/tujesiteranebuteduladi.pdf In PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/68969179472.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/xibovixo.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36619262466.pdfIn PDF document text
    • https://masukpt1.com/contents/files/69023023804.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345644730c7---zonedewurobusevujefavuxe.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/95776835075.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/sedubatididuwezup.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/94828137990.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210914071729.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/77472765681.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/vugodozeduxu.pdfIn PDF document text
    • http://hybsch.it/upload/file/latarugawatal.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/94677475056.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/dopodomovix.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091004360273499.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/dizejumewakoxoloweraf.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/92598451541.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/luweluvugigilixiboxikawov.pdfIn PDF document text
    • http://speckrepej.com/upload/file/50991413213.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/tumarituxewokoj.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/busozoxojaso.pdfIn PDF document text
    • http://mega.kz/media/upload/files/kefelidutofimobelaxig.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/jogid.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/zemitifesafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pay+infinity+apkPDF 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_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 18220 bytes
SHA-256: d5e0e40efe9ce95ef21910ce2258eb148815ea4952895b72f3119b48af6b07f6
font_01_sfnt_off00010afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12311 9992 bytes
SHA-256: 3bddcb041de52c46f5fc152bf0d04548aabcd4d25369019f2e09f23cc29d67b4