Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47babb279a8082b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 04:44:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dbbf8122b53b2ca6ba6ee22e41b0e792 SHA-1: 63de083b9bda6d46ef40d9f3809e8bbde10c46c3 SHA-256: e47babb279a8082b08bfe4ee0876c2f0a42726f071cf33e4b56f94714f7a49ac
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm, a common tactic for distributing malicious content or conducting phishing operations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sdds.be/userfiles/file/7802454785.pdf In PDF document text
    • http://sunriverps.com/data/editor/file/38584597640.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/79646806292.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/xesedakekexapa.pdfIn PDF document text
    • https://casaalu.com/luutru/files/62519665435.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/kixipo.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/xoxibilejudexitesuxe.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/detupaburup.pdfIn PDF document text
    • http://101balkon.ru/upload/files/xoramo.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/delivususodasajomediv.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aefd91267---tigenumirefugusidawinaxa.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/58115582254.pdfIn PDF document text
    • http://amkchem.com/upload/files/11968930561.pdfIn PDF document text
    • http://retailcop.ca/files/49246675727.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-20/20210920025520819874.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/tifegixez.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/5evpp9i1u6fomeji9h2sbqh4gv/40547581326.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/budezetasuvuxonaka.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/29626193241.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/riluwowadotixafotaz.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/64070131812.pdfIn PDF document text
    • https://polytex.de/sites/default/files/kaxitagoditerosaton.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/87853123878.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/mupumubegirakubevorozamid.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/92623884541.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/tokesav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=worksheet+on+ecosystemPDF 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_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 16856 bytes
SHA-256: 9272acab55a187a97428bece9b584bcb9f61050d0a005b860f4e03b7a43f0b6b
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A5 10396 bytes
SHA-256: 383d2ea071b4559e00383bba0025e4503736c0465515c69eef927a2820854dd8