Malicious PDF — malware analysis report

Static analysis result for SHA-256 febcf371f40030f6…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 15:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e211765cc7012490b98b0c07bb803f85 SHA-1: e45a436dd97c989f8bff51bb4070a68ca6874514 SHA-256: febcf371f40030f631f0cc1b038991c5456304ae8d34f22e394f8308771df7aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating an attempt to obscure the true destination or spread links across many domains. No scripts were extracted, but the overall structure and heuristics point to a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://przyklejki.pl/userfiles/xulatisemeradonidana.pdf In PDF document text
    • http://homestationrealty.com/userfiles/files/88855392543.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/lurobizugepeg.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/83027817511.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/75906488357.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/sodobokeja.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/25544661121.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///7888677995.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wejemavoj.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d45b9adcc---90455737971.pdfIn PDF document text
    • https://renetravel.ro/images/files/29053318826.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/29799577280.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/75515165328.pdfIn PDF document text
    • http://exima.kr/userData/board/file/3979690863.pdfIn PDF document text
    • http://valkexclusief.reviews/app/webroot/files/userfiles/files/pofefazuweteniwo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff71e8b7dd---87565034930.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/bakifilememu.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/17488887747.pdfIn PDF document text
    • https://vespaclubcagliari.com/userfiles/file/fopesofakebe.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/bigigodolekif.pdfIn PDF document text
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/rizobaxis.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/75636750474.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/95835599211.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/84492825835.pdfIn PDF document text
    • https://dm288.rs/slicice/file/vojoresug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=omegle+video+chat+app+mod+apkPDF 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_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DD 10772 bytes
SHA-256: 5200b266f433c63349835345c72b451bdc707af96aa9778ee3f964a7b49db0e7
font_02_sfnt_off00011176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11176 17584 bytes
SHA-256: 4934dbed9d80227f81bbc953be6334701b6b22904d5dbe1b62fd99ffe1bc059b