Malicious PDF — malware analysis report

Static analysis result for SHA-256 e51dc1e6097af4d5…

MALICIOUS

PDF

71.0 KB Created: 2021-09-29 03:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 463f1c2d707b0967fd39b30f88836230 SHA-1: 2d78b0a05cb33cd6dfc366594dcad81d347d16d5 SHA-256: e51dc1e6097af4d5af73daaae8a3aae4f49ba08f0abca774b61ed12f750b4bb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and structured as a link farm, strongly suggests a phishing or malware distribution attempt. Although no explicit scripts were extracted, the PDF structure and external links are indicative of malicious intent, likely to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=greys+anatomy+season+16+123movies PDF link annotation
    • http://islenapuntos.com/campannas/file/29670682653.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/vefofijekiwaj.pdfIn PDF document text
    • http://sdes.in/uploads/17433839949.pdfIn PDF document text
    • http://aa-nusd.jp/negasafiremixer.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/60360556229.pdfIn PDF document text
    • http://www.thaitofu.com/image/upload/File/34406391812.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/86142336223.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/bukarosutasubep.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/wekiw.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/39260040193.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/11123039563.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/14674254048.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539bed9cc3e---53258127661.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78036990812.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/fugezewefexokufivudiroka.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/98720871850.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/29880597367.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c3e6bd6a22---91190741148.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210904004746.pdfIn PDF document text
    • https://ratodua.com/contents/files/28863880331.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/xinudimobisakomubo.pdfIn PDF document text
    • http://lagrupacio.cat/file/70955171367.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/waxifuxibudobob.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/51353108113.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/datidojotepotezibuxa.pdfIn PDF document text
    • 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_off0000b2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2FF 10956 bytes
SHA-256: 9e8f68f0bcb28adc735cb1a3731ab1e4ffafea83fd19bea77f116e5afd58015c
font_01_sfnt_off0000cc9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B0 15796 bytes
SHA-256: 3804c9cd39b1bda3fb187c24cb6b5d9da17b2dee544d2bc869e41082def14e79

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