Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cea809838067077…

MALICIOUS

PDF

87.6 KB Created: 2021-09-22 21:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 17cb28fc1212453bcc5e445cfcb269bc SHA-1: 68fd58510f125e2a0c32e733aadf073236ac4dad SHA-256: 8cea809838067077b173685e054728615b301e83860082dd1ee7b4848cc2cca3
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://mdbim.pl/ubezpiecz/obrazy/file/635367560.pdf In PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/21098700015.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/99632670104.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/zatopifubonanamotibeza.pdfIn PDF document text
    • https://asiahealthcaredentalcentre.com/ckfinder/userfiles/files/93493147692.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/belidotaneruwinuragit.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/82862749772.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405f13346b6---suledufawujovul.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/99611416311.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/g3gmd35fsbqrn3rbhrog8b27mb/28604805868.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/74863321939.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/lipizit.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/gevavuwapele.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/penunubevulek.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/62063693178.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/puxefumizulukek.pdfIn PDF document text
    • http://stuarteisbrucklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74316915944.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/raxokeregesedaza.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/45226217954.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/46808845012.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/32525364021.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/20241370530.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/xesokavuxobifoziziw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=kali+nethunter+nexus+7PDF 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_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 18780 bytes
SHA-256: 49c72043c1c2996aa560f9f549a077e4b929669b03d26c6073baafc06fb6ee8a
font_02_sfnt_off00013981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13981 10328 bytes
SHA-256: f1ca72dc812ea7007dfe91623497bf7a9856522968592d9ded97bc6f03675886