Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a847eeea9862f65…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 05:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 47b421b096c6445824b4872c208e514c SHA-1: c9f10200a255f464661d2a6f2795dc0858edd316 SHA-256: 4a847eeea9862f654d72cb6681f7df563c4ddc53ff394d85960cc7d3c5315080
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating an attempt to obscure the final destination or distribute traffic across multiple sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://tradotel-riviera.com/file/99812646164.pdf In PDF document text
    • http://showplus.ae/userfiles/files/somupewepejixekij.pdfIn PDF document text
    • http://clickvay.com/upload/files/xavewasi.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/10337516856.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/22207173485.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/riwebusazud.pdfIn PDF document text
    • http://fitviewer.biz/files/file/129661039.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/72242962730.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/nefuguralike.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/63577193578.pdfIn PDF document text
    • http://zapatosperezcabrera.com/ckfinder/userfiles/files/vuvunoxusi.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/mexozeko.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/67062736285.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/83062352404.pdfIn PDF document text
    • https://hotelangela.hu/userfiles/file/37326912104.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/barofedofipudekedox.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/purodegojigak.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210919023309.pdfIn PDF document text
    • http://fivelscope.net/fckimages/70861981673.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///18630834056.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134adcf518d7---bewidirasibu.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/xiwevidegapib.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/vezovafejifik.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/renupiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wwe+royal+rumble+2021+live+stream+online+freePDF 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_off0000de34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 17948 bytes
SHA-256: 1bd7292123784b1c5cc13d4aaa086370ada9c8ceb79ce72b792665c61349fddf
font_02_sfnt_off00012530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 11168 bytes
SHA-256: 27a8fab1fc2ba680736e8e6c35dc63fcdf65a43197fc54fc20bbfb41722bcc24

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