Malicious PDF — malware analysis report

Static analysis result for SHA-256 dee1abb9c4ebed45…

MALICIOUS

PDF

75.0 KB Created: 2021-09-14 09:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ae6755abc52e1970ad2dcf70c3502ed6 SHA-1: 761f77bd325e30733498e9c142373781b4ace4a8 SHA-256: dee1abb9c4ebed4588ebad823dbccc317be93ae3e1a8d1832b7d352809084ed1
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering to trick the user into installing malicious software. While no scripts were directly extracted, the presence of numerous embedded URLs, some pointing to executable files or potentially malicious domains, supports the phishing and malware delivery pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/79143125247.pdf In PDF document text
    • https://sadhankendra.org/erc/media/litemorege.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/3271841045.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/zujonizafuvijepodoruvi.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/tulofimidapuwix.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/45355278422.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/98384400161.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/98620522089.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/wuwubetomum.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/lulidiporafijaj.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/xopapukugadokopekeb.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/bubosotusulawir.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/xibopuvozifamitafenapuvij.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/duguxisebovokes.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/roxibinosebekar.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/xorakiduro.pdfIn PDF document text
    • http://balone.net/_upload/file///5341568592.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/20578615932.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/1990001777.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210903140105_npdxbu.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/towuvi.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df9f9e373b---92285695842.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613856f951107---gakijebupilubufupeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=best+browser+for+phonePDF 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_off0000c365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 16668 bytes
SHA-256: 1faefe1ff2b47379050999627fb55aa91cd96792d107b1ec22afce42cce1d4de
font_02_sfnt_off000106fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 10436 bytes
SHA-256: 1b85f7e71721b2177e03de4a53fbf68af46810a9378ce24ff25b1a6c6b46ceb2