Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a443c45cf0e47d1…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 22:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 93ed3abd43475b7b0cfed468bf680a6c SHA-1: e712a8664d0d096fb0d2fd4f0319a73051d483f3 SHA-256: 1a443c45cf0e47d1b920997b666f0acdc109ac9e5975b9402a144f9be62969d0
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a link farm, a common technique for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and does not provide direct clues, but the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://aranykoronakft.hu/userfiles/file/legigurapebepetijed.pdf In PDF document text
    • http://keralatravelpath.com/uploads/file/87402793406.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/ralifi.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/bebalufibabijin.pdfIn PDF document text
    • http://hopkim.vn/upload/files/wavamabalogowesejexexerej.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/nigofab.pdfIn PDF document text
    • https://dalba.net/other_files/File/49757101756.pdfIn PDF document text
    • http://ipllaser.in/uploads/66711988035.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/7j57l3edanivh650ffdath0lo5/xojivupezomug.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/ninifegoj.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/40640822762.pdfIn PDF document text
    • http://methese.com/upload/files/sezelafalinap.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///46384760465.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9752df98223fd9cd0c60d7f11f2341a2/52726483883.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/nemiduvefas.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/xamufonirawebageninoxiduf.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/detagofanijibutuzumepamer.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/94131145990.pdfIn PDF document text
    • http://orem.mn/uploads/files/votunevoxan.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/29544512595.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/donowamatobabikupove.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6d2015e6d---sofogetamofunezij.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/pubuw.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/lumefobigaludeguzoburumep.pdfIn PDF document text
    • http://www.bash.cl/media/file/47445254946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=drive+speed+simulator+mod+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_off0000b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D9 16612 bytes
SHA-256: 9043b838085bebfcda0423983fadc9decb9783bf9b2d8e1bfd1028f46db434a2
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 10708 bytes
SHA-256: 7fe22278d35f3dd09bf5342e8c20cbb3357b2b6a0c5b918743017a0b133b43ad
font_02_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1