Malicious PDF — malware analysis report

Static analysis result for SHA-256 77011d077833704a…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 11:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6250769448dacec2a973a6258604f77a SHA-1: 640550c27ec2b45618e4e7eb08179b089e13efd7 SHA-256: 77011d077833704a129c18230f01794e89ae8752653041e091a5d05bea58ff0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one heuristic identified it as a link farm. The presence of embedded URLs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the overall structure and URL distribution indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://rotitelor.com/contents/files/19638196745.pdf In PDF document text
    • http://nigerseedindia.com/uploads/podasi.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b689a4e68---rudizakejomoz.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bawalikapelupiwoxurim.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/14327454694.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/wawogudoxopoxega.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/70451608446.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/46495121778.pdfIn PDF document text
    • http://termocity.by/pics/files/16677897973.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/46939060258.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/jirosawogibiji.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/lujifemomarekodenovutow.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/suxowaka.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/32559927288.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/52715104149.pdfIn PDF document text
    • http://ux-school.ru/files/files/dejiwo.pdfIn PDF document text
    • http://baoveantam.org/upload/files/mojubojulukuvosalabegumuw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130bc12c6cb9---navevidelefetedekutewi.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/86993255673.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/penuj.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/piwipe.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/20250638576.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/xoromige.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/24529522822.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/pupivowufujofogiza.pdfIn PDF document text
    • https://dacola.com/upload/files/fonotinebo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=book+of+satanic+magic+pdfPDF 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_off0000c041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD853 18016 bytes
SHA-256: 3addf9cf6f2e414aba27d80486b6149b2364c4402ad2cbfc57197441b2063807
font_02_sfnt_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 10832 bytes
SHA-256: 5333af7e486c4579723a9280bb93cf4e197ecace6fcce6722e5913643e4d1930