Malicious PDF — malware analysis report

Static analysis result for SHA-256 2901fd83c44b7414…

MALICIOUS

PDF

84.4 KB Created: 2021-09-11 10:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66383a8ac94cde168db090007b4e5b65 SHA-1: 98af270a04e62d8a509a9e627b91f5d081e10f99 SHA-256: 2901fd83c44b7414af74795830c2838e8abbb7c8e1a9dd5fcf8e54d874438298
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://archism.ru/uplcv?utm_term=the+amazing+spider+man+2+data+download PDF link annotation
    • http://keystoparadise.com/userfiles/files/26858683529.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/bajatatetoxorajilej.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/30006396253.pdfIn PDF document text
    • http://petgears.com/app/webroot/files/file/43627192068.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb92babda---89786806718.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/7191916087.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/96764042951.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/dobolalapegovuworizekanel.pdfIn PDF document text
    • http://kvrhousing.com/uploads/vawusun.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090719273473499.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/45415849923.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/68997249895.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/63337134922.pdfIn PDF document text
    • http://klhl.com/userfiles/file/kezagewoxu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/bilufozuko.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/tizesawuvipoletagor.pdfIn PDF document text
    • http://clickvay.com/upload/files/73448397496.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/27430778939.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/55054642955.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/17540843832.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/kavukusaranelotow.pdfIn PDF document text
    • https://kenadong.com/contents/files/watemiletiburukosozajebo.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/90733484698.pdfIn PDF document text
    • http://www.taxivanclass.com/uploads/ckfinder/files/83981331132.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/jikazaxugazusumito.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kofosuf.pdfIn PDF document text
    • 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_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 11068 bytes
SHA-256: 216e9b7abfedcc49b759fd1a0c1a25c6f3784a80d3c7d4ca2ee9dfa3b0a4315f
font_02_sfnt_off000114a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114A3 17924 bytes
SHA-256: ab791fb99011af44a411ea1ddb4207f2c254cd97d73288f67985fbc5e3d2a2c6