Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d9ae5bbd489ab5a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-16 07:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 20e38effc07a7e0bbba21d492e36cd8b SHA-1: bcf9a0544bb605b7f0a487a5eda64b47147d6368 SHA-256: 9d9ae5bbd489ab5abae4357653e63ae3ec5691570aa589268407ae160f1ed992
166 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_REMOTE_SUPPORT_LURE' strongly suggests the document's purpose is to trick the user into installing remote access software. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs pointing to potentially malicious documents indicate a phishing or credential harvesting attempt, possibly leveraging a known exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://studiopol.it/userfiles/files/liwotawomogakobaj.pdf In PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/zususukujebobij.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/3904400874.pdfIn PDF document text
    • http://digifast.cz/userfiles/kelopitovezasan.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/numokesakuf.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/44984086547.pdfIn PDF document text
    • http://hkwwta.org/userfiles/80261726621.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/9492669375.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/sivaxajekozojoj.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jorinusazaxepa.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/62233722993.pdfIn PDF document text
    • http://abpaluso.com/upload/file/vipumezelebolufezutofaf.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50784187330.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/sazagobogu.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130ff00e87af---9587763796.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161408e05e6083---komuzojozesetigopap.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/rawiru.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/tisofom.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/79217468549.pdfIn PDF document text
    • https://dukupahit.com/contents/files/bogizuvotogugap.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/10981395378.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/susutemowavovitopil.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210914180509.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142bc3dabea2---68989121582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=taught+curriculum+meaningPDF 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_off0000be5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5E 10452 bytes
SHA-256: 39e4977d9bc1974002e1880eec4f71cc789b99d9a2e0eee2078436545b95df78
font_01_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 16788 bytes
SHA-256: e2bfeade68d77cdac5cae7c9dfd69b93d83431c34fdf4325f32068e7b0414c02
font_02_sfnt_off000100c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1