Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99cc7fb044f9027…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 09:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a4d2691f26f6c07c08c0ed028c51e70 SHA-1: 5152423cf12b2c40914c330a218453a1c8f22125 SHA-256: c99cc7fb044f90271fd1776fc21b3621647264015077366bf1b50ecb8fda246a
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to suspicious domains and are structured as link farms, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate effort to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://romengo.com/ckfinder/userfiles/files/ripagoma.pdf In PDF document text
    • http://baracenter.be/userfiles/file/zuvutinomi.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/43780224648.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/68675474492.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/77522850282.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/57306195486.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/bigaf.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/28265815683.pdfIn PDF document text
    • http://12shio5.com/contents/files/voweledol.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/kuvopo.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/27629299228.pdfIn PDF document text
    • http://webursitet.org/Files/file/varofefasivifo.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79456138624.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/91459319342.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/69672829881.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/vupimepilusab.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/kajisel.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/kisegadozeruboxagobuzabi.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/92186114534.pdfIn PDF document text
    • http://gibisch.info/files/files/darubawowoz.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/rusojeborifasokoletimuk.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/betuj.pdfIn PDF document text
    • http://enkepharma.com/upload/files/23417861955.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/weluxuvotizenotuxugutifit.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16130609e0a659---9243611648.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=behringer+x+air+xr18+app+androidPDF 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_off0000d4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F8 10776 bytes
SHA-256: cd729f16987db848832a8f77f405ea3f364981e2008d5aedcfc5dede2b1a17c7
font_01_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 18380 bytes
SHA-256: ae5c3fd76ade30269563be1351996a31a89ebc0835d42e55c90980ae8156df91
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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