Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa4e27c71c8c456…

MALICIOUS

PDF

86.7 KB Created: 2021-09-10 00:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2abe92b1dbc26256604bd85b1efe795d SHA-1: 875e4df0359b5cbb14a54a77253e09d7192bbbc2 SHA-256: 0aa4e27c71c8c45663b1f0a3c17fd87d526f1564e3b3eba0e07cb0fda7a2085b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document functions as a link farm, directing users to multiple distinct hosts, which is a common tactic for phishing or malware distribution. While no scripts were extracted, the presence of numerous unknown URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://finpacecuador.com/userfiles/file/46504471202.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161323f31bebde---21540575594.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/juxanuwoxetoge.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/23758667157.pdfIn PDF document text
    • https://ms01bet.com/contents/files/54753293524.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/govobadojupesoleduxelagal.pdfIn PDF document text
    • http://xsteelstock.com/d/files/buduno.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/96106169115.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16138d17a03ba5---14909976372.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/tuvavekigegajobulup.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/babaxilisuduteler.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903092924118.pdfIn PDF document text
    • https://bselink.com/userfiles/file/69508851621.pdfIn PDF document text
    • http://paradoxine.com/upload/files/53193299718.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/luxiwidatuwogo.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48848126009.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/dosugugibejisubufin.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/34558231312.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/5611874023.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/rinigawopibunugap.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/91916580698.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/25541257071.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/wuzudufuxazesulosape.pdfIn PDF document text
    • http://reylab.com/userfiles/file/12173521010.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/87147915882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=good+3ds+emulatorPDF 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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 17528 bytes
SHA-256: 4a3f8fe7760d5d6caa631351cce6a6e2621dc41296c171a6918ba7aad6a75f3c
font_01_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 10524 bytes
SHA-256: 8f982bfa8a4264ad28bcfdab5f0a13f4c89860c4bcc88aaf91553ed602e9a0a5