Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fec89b2bb05d79…

MALICIOUS

PDF

77.1 KB Created: 2021-09-23 10:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 97c7a38d3439694d7b1fca99dd7068b1 SHA-1: 888e413a81e6de728feca228719e00f6c9534e44 SHA-256: b5fec89b2bb05d79110c424f8acf711debb799558b812f43fd904d4aad0617a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://al-bandak.com/userfiles/file/89416834612.pdf In PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/wunamu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/govezedu.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/xixemaf.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/kibavedigofagidogabuso.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/27256240075.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/411236807614251bab9750.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/bivibexexuxenesetew.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/zilolizifogawimolutegemax.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/jubumizimezamokelurunelev.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423c9eb9146---29503140053.pdfIn PDF document text
    • https://deepex.hu/hirek/files/57327909495.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/82971860423.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/munujopa.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xafanimawexipezome.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16131dcf49a064---teralifakukol.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/kosuratubepif.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/banapupaxozijufog.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/18727493637.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/kiwutu.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/17138325762.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/sezokikunagazalub.pdfIn PDF document text
    • https://tavio.ru/files/file/verepoxijelowoxadab.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/19328554414.pdfIn PDF document text
    • https://medtek.vn/storage/file/jeloxozadepazeri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ben+10+slammers+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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F5 10644 bytes
SHA-256: ba767219a8ee75e54d815c86cab040b0d501c7b6a42b0ccb61570d9d63494054
font_02_sfnt_off0000fb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB49 16916 bytes
SHA-256: b3484bbb4faf3009aa3493a3c6175fa9fbe3ec3bd4832d034962915e01ef5208