Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c5e83c191a5bdd…

MALICIOUS

PDF

54.6 KB Created: 2021-09-18 01:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6fd06cc944ca61e35e4e78ed2961dac SHA-1: 58daf4970a9d87017a78330bafcb27d274e12e11 SHA-256: a2c5e83c191a5bdd9414b70a0e0c4fda8f3b8800ca0cc2e8d6a15caceb8ffaf5
124 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is described as a link farm. This suggests the primary intent is to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the structure and heuristics strongly indicate a malicious intent to exploit user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8171

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://teplospectr.ru/images/files/78423138156.pdf In PDF document text
    • http://iglozawiercie.pl/zdjecia/file/lujipuloforosed.pdfIn PDF document text
    • http://shesob.com/file/files/14346107318.pdfIn PDF document text
    • https://profm.hu/files/file/79764678780.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/bewotososose.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/22674652626.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/57518522388.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/76846826303.pdfIn PDF document text
    • http://fteq.ru/files/file/binonowavefuk.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/gazamadovu.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109092312091596.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/79655594567.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426a82e2387---92905888028.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/47310477412.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15116293703.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b37ac3e2c---94836589273.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ludenawiwosofu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/guxutuzoka.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/19151759265.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/12399479671.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///walebumagopivusisu.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/xiwugafopukapuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=american+pie+2+123moviesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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