Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c275111ca1c5e4a…

MALICIOUS

PDF

66.1 KB Created: 2021-09-26 14:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 61f61440042751e97cc95638d404f99e SHA-1: ae1b5e7ca1747a705128bc30250db326b2eed6f5 SHA-256: 9c275111ca1c5e4a9a95ce67c7dd23426c290525b94d88f26df30f8291dc7f85
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to different domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of many distinct, low-reputation domains suggests an attempt to evade detection and host a large number of potentially malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://daeryuhealthcare.com/ckupload/files/58760596299.pdf In PDF document text
    • http://dakhoanhanai.com/images/files/40627451840.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57320941274.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/zugadekokeweku.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/fafuwiregovugetaxasopu.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/402ff7e5656c76490b9dd5395eacca2a/30130422837.pdfIn PDF document text
    • http://ptk-tent.ru/userfiles/file/36985300149.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/xorumujod.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/15739213594.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/fuzatofimebufenoli.pdfIn PDF document text
    • http://mamitobe.ru/files/file/15651753563.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/fefenemo.pdfIn PDF document text
    • http://raczcsalad.hu/files/tubeguxok.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/52444946865.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/28251695676.pdfIn PDF document text
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/sakobeluxiforitivadev.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea7e332103---30399080884.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/mobemapusoxekefogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=tap+browser+for+androidPDF 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_off0000a838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA838 14100 bytes
SHA-256: 50513692fa2da56828cd69fad2432e07dc2506cbafb472819962267925b87e2b
font_01_sfnt_off0000cbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D7 10536 bytes
SHA-256: 9414a89edd72740359834b9950f4125431ea1b27bd05e65667d8381f38965249

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