Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c7e72c7d79ce3e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 02:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c0d1dc17412bd13560a22bfb0237266a SHA-1: 17fd9a4bd38d6454dd07e53fa3eaa14d2fc3472d SHA-256: 77c7e72c7d79ce3e4b5276e29ee50bf70b5959b50e5b108edf2a48fa61b2d81c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to numerous external websites, some of which are hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://ladymamashop.com/uploads/files/202109110404223506.pdf In PDF document text
    • https://sofupingame.net/calisma2/files/uploads/11956921370.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67bd3c36ef3ccf36e42a0a7f18e55ee4/45310511730.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/jesebugojododujasop.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090318140957.pdfIn PDF document text
    • http://steinemann-ag.ru/viwawarozubokex.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/votutinowarefunofaxox.pdfIn PDF document text
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/53553090511.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/5426648789.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/41927645543.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/40229343352.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/xexuvodewepamumo.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/3126254904.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/74103318806.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/26407048465.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/7219625894.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210913054428.pdfIn PDF document text
    • https://aashianarealty.com/file/58730477827.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/96217379521.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/roxolovokixurinawov.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/44404631576.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/87106506488.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/mikuvekogagezupelabaduj.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130255628d17---82671263434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=buddha+live+wallpaperPDF 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_off0000ce6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE6C 10304 bytes
SHA-256: 0c7c2e4b243379cac1a55f8fc92bc95019d1c58d71716ada5a8ead730faae66c
font_01_sfnt_off0000e5c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 17932 bytes
SHA-256: d9c500b87006731f4ace2ecaa58200fb5ff5608d6ff8d7b60b29d4cb8239ce67