Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc3f5433e308e499…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 20:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2eff2c85edfd94aea81d48db9b95f9c3 SHA-1: 10edfcd781f5941ad63ede19cda8dbac3b186ccd SHA-256: fc3f5433e308e499c977222752fe774b067428cc136a072c8c6ec3c8e8f7bf38
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses a social engineering lure to trick users into installing a browser extension or update, a common method for malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for further exploitation or payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vizit-k.net/uploads/editor/files/28659378128.pdf In PDF document text
    • http://khyljg.com/uploadfiles/files/93813438288.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/efe9f1948e8ba99e0e072e423800e5b8/kebaziguxudon.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/73591950982.pdfIn PDF document text
    • http://bibikid.ru/upload/19845399743.pdfIn PDF document text
    • http://ryouhurt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77677308971.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/malexa.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/torumufexe.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/mikobeso.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/gakexogatavapuketivitaxo.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d56b14f1f---28925202255.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109031828164666.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/71953626979.pdfIn PDF document text
    • https://ivanamihic.com/files/21374879851.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/zodadiw.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/rugukipotilo.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/77053253546.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/46380380586.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/xaxagolenofo.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/sazexegoxasaminumixumu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/88992295396.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/11622827203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+can+i+get+robux+for+free+without+verificationPDF 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_off0000de42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE42 10884 bytes
SHA-256: e5df26450835ab157ef09b541b0552d44a83bf11174e62421120e3e7a85533cd
font_01_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 17928 bytes
SHA-256: ecde1f76a0f07b4648acfc5abeda40be8620a74354b1e31cbfde02451ae9fe4e
font_02_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1