Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f04045835afeae8…

MALICIOUS

PDF

61.0 KB Created: 2021-09-09 00:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d0c9a3e5d56dd1a1e6eb63b4f6232fb8 SHA-1: c3d97dd90c8626852c2633422103e6d12e90cd89 SHA-256: 7f04045835afeae86886eda8547b99d3413fdc5afb2cae92ec0b33487e26ed1a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically points to the document's purpose of directing users to a collection of links hosted on disposable domains. The embedded URLs and the nature of the heuristics suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8034

Heuristics 4

  • 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
  • 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://orthodoxnews.us/file/mimekonidisubefimawuwojal.pdf In PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/kupal.pdfIn PDF document text
    • http://boki.hu/editor_up/77432746765.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/10540951713.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/vivolomulubipazopevu.pdfIn PDF document text
    • http://hotstamping.pl/files/file/53255232150.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/subimotuxumowesan.pdfIn PDF document text
    • https://preciseenergygroup.com/media/34538945876.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/43363833655.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/najimilifebazusufonop.pdfIn PDF document text
    • http://myphamasia.net/upload/files/kukibin.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109080452222316.pdfIn PDF document text
    • http://stensoproject.com/userfiles/files/ririrawalu.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/lopilezatojike.pdfIn PDF document text
    • http://iucecb.com/files/file/bubof.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/vexuji.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/pofisagogosizoxikanud.pdfIn PDF document text
    • https://hoavily.com/uploads/files/78163814828.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/xewidetebikabikozasew.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131712d15db0---70883877137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=remount+sd+card+androidPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 10628 bytes
SHA-256: f5fa2f246e042f487b4b69dcd3ef4b351a301434e917b46f473c72e3e75aa940