Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d5fc7f410801d2a…

MALICIOUS

PDF

73.6 KB Created: 2021-10-06 11:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1e4cccb76879551aeac56affb9c06ede SHA-1: a98ec97cdac7434c12e1af87e4a86b53f4ca3cba SHA-256: 3d5fc7f410801d2acb54d0d76a7c75887cf694f5bae1c74fc26480a064e791c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, suggests a phishing or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with malicious documents designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://generoussecurity.com/uploads/97448696847.pdf In PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1d1e03da4---wekizaxedo.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/mulizuvemebakasotunade.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/86578956180.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210904220249.pdfIn PDF document text
    • http://sadvita.lt/pav/file/zuwofudowupazitozuk.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/bakarodon.pdfIn PDF document text
    • https://tomaszbizon.pl/web/uploads/files/dovivuzexukozinazodexuvi.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/99805017710.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/dunabaneg.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/lezojurogezopomeb.pdfIn PDF document text
    • http://eternaseguros.net/files/files/68439878320.pdfIn PDF document text
    • https://domilot.com/uploader/files/26987062860.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/35249797405.pdfIn PDF document text
    • http://dayuntang.com/assets/uploads/ckedit/files/20210909131133.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/62238398746.pdfIn PDF document text
    • http://bankerz.in/qpic/files/57763551870.pdfIn PDF document text
    • https://shreeaksharinternational.com/webroot/img/userfiles/files/67047051966.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/50187650497.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/fitukilapowiwerazinabavam.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137375361da0---figusex.pdfIn PDF document text
    • http://specializedfacilitymgt.com/public_html/userfiles/file/73355432900.pdfIn PDF document text
    • http://ardeche.proximeo.com/ckfinder/userfiles/files/pofaxolavuxekasuwedot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+you+remove+blood+stains+from+clothesPDF 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_off0000bd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55B 16300 bytes
SHA-256: 0642a1bf6bb59eca35391d4fd365ff96686622425ba4b5777c2f375e55da1420
font_02_sfnt_off0000fedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDC 11240 bytes
SHA-256: 5549f4db96054ef9bbca0accddd4c6a4940722b98dbfb60f432b2c5bb096703f