Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e56f54d582803e6…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 10:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 056c10dbdee06dee30275a4f157b4ed4 SHA-1: ab2dec0f9ade7798c197f37e02518507c08a332d SHA-256: 8e56f54d582803e642978662d35d4a74972a26bb087bd623be4149cd5a98d56a
126 Risk Score

Malware Insights

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

The PDF contains numerous links to various domains, with a high concentration of links on disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of many external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point towards an attempt to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://shangrilayunnan.com/ckfinder/userfiles/files/tefegexesivemeduvogo.pdf In PDF document text
    • http://underbutter.cz/download/foto/buwumoruvegakufizekez.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kifalukazegotad.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613557777c6f9---5477502474.pdfIn PDF document text
    • http://usateatop.com/_upload/files/fulomaxeguw.pdfIn PDF document text
    • https://reha.bg/content/upload/file/98968261987.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/57331204331.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/sitezen.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37741792079.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/49967193732.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/14276747114.pdfIn PDF document text
    • https://foulardfotografando.it/file/18295712613.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/bewugofolabemegu.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/jirurilujabifedid.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/171233339761353bbe7d056.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/11432012676.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/wuvepuvugak.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/17573902872.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/24932862267.pdfIn PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/13525985385.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/28971453717.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/64045096171.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202109012223284204.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7c643974---9277899920.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/55686690201.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/4137607035.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/maluzumemolag.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/pokakazorija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+take+pictures+off+my+phonePDF 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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 17436 bytes
SHA-256: 5704a65945985d5fc761436ba780dbf96318e481b07d42166a6d5e7379a302e7
font_01_sfnt_off0001157a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157A 11220 bytes
SHA-256: 375176d7643e9e92f4b456fe65bfb293eac38e62830a5041f346d1503f80872d
font_02_sfnt_off00012fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1