Malicious PDF — malware analysis report

Static analysis result for SHA-256 998002ab660799a4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 11:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 246062b383bfc4804431e2795e55454b SHA-1: 71011b615c786e958ccb235aa3d04fbac828e918 SHA-256: 998002ab660799a4335e79a2beeaeee87bd98c833fc156e70df25f15111ca89a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a large number of links pointing to various domains, with many identified as disposable hosting, suggesting a link farm designed for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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
  • 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://groupekineconcept.com/userfiles/file/jefaloji.pdf In PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/tonofenikijaw.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/21133247072.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/68512703057.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/kiguxosemena.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/zuboxoxiludewanawukadeje.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f07f0b261d---74925961583.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wajano.pdfIn PDF document text
    • http://china-guolin.com/filespath/files/20210907175254.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/gimogapikepetowonubalor.pdfIn PDF document text
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/28824919021.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/mepisumi.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/978096408.pdfIn PDF document text
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vogediwilajawo.pdfIn PDF document text
    • http://exosushi.com/uploads/files/tolagofaxazuroker.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/20943165421.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16138a30d16f06---98577909195.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/tosekuz.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/59240401906.pdfIn PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/92026832278.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/81010923811.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/murunexevutivunan.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/mimun.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/vabiwe.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/5159696397.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/39441510283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+get+turning+point+of+parabolaPDF 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_off0000d1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DC 18016 bytes
SHA-256: 1d4ac6e42527f76388b6f8a3b802646a88e5fa4c7b635ac787116d60dff2d3ef
font_01_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 10680 bytes
SHA-256: 69c4566cb6608478dbdea85343003f6d7e2bb8a48772053930422e8bbf63709a
font_02_sfnt_off00011991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11991 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1