Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec6926d54bb1c49b…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 15:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 641d0feaf00ee4989af23d85050e777d SHA-1: 87107ec6fa92d1ee5616f340fae1b103d0699a0b SHA-256: ec6926d54bb1c49b23547b349aea3a9c89abe7cf2b3181a943c1e8b76659993f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are configured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to obscure the true destination or host multiple malicious files. ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613983df4bc45---51228055794.pdf In PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/48876418031.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/kipojepozezipi.pdfIn PDF document text
    • http://exdebt.bg/userfiles/file/39275193875.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/31991802503.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/41754533456.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/15521221690.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///35815285180.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/zureguwi.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/22227712964.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/bikunopuzeximewowa.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210916025424.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/kejam.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/nazepeb.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/78593290901.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/18404091888.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/japojozero.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/16631249156.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/boxofelujige.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/96957972006.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/79917409749.pdfIn PDF document text
    • https://banghenails.com/upload/file/dedamaw.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/16554655553.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/14230808447.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/bem8mthpao7a3dkqifugdnthdn/butalisanunepojo.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/21786816970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=homm3+android+apkPDF 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_off0000c17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD990 20784 bytes
SHA-256: 8f96f218ff85950e09cc0149d8457ca88a6c6b928c0f24276b90fd67edab72f9
font_02_sfnt_off00010e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2B 10364 bytes
SHA-256: 66a93d4e38d719a46084a9afad66209b759cf5e5dc6d23071a2a6d5ad26c9967

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