Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe12adeaeb030765…

MALICIOUS

PDF

77.3 KB Created: 2021-09-19 17:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2290703f2bb9c81e6f1be7db5f85c5b9 SHA-1: 747ed2709af1423b424d5801a2b8d5c43c5ef157 SHA-256: fe12adeaeb0307654832bfdb626c8a324126b947b1cab4bdf17bf85f850b7bf9
166 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to PDF files on various domains, suggesting a link farm or distribution point. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it may exploit vulnerabilities or lead to malicious content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cornwallstaffagency.com/userfiles/file/fuvaxopifasudegasof.pdf In PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306312535757.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/34999048195.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210914183039_84pnt3.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/30206973762.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/94976001312.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/28527101350.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210916025545833.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/64450501370.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/5322192931.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/59674804587.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/37375242247.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/23951416763.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/917365669.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/17237551636.pdfIn PDF document text
    • https://yenhuy.vn/upload/files/sidezibezoxubelo.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/giduwibib.pdfIn PDF document text
    • https://digireg.at/upload/57609749083.pdfIn PDF document text
    • http://benetalent.com/upload/files/finarewolopomusare.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/36996507091.pdfIn PDF document text
    • http://kag.fr/userfiles/file/25927899206.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16139182bd04ef---21184065546.pdfIn PDF document text
    • https://lorus.rs/files/96403369027.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/97539390515.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/voraluvifukovadugob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=switch+android+emojis+to+iosPDF 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_off0000c641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC641 10880 bytes
SHA-256: 590ac565afc66383e47952f5b500712dba33001fce3cf752d670649b4b14062e
font_01_sfnt_off0000df3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF750 18600 bytes
SHA-256: 3bfc23edb21004e61822ab4109438896aa178d798d5753150a99b068fd2b4dce