Malicious PDF — malware analysis report

Static analysis result for SHA-256 0455fc219a27cad8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-19 17:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 745272d3a8e149b7deaa6619b2d7faa4 SHA-1: dc2b13394c9983cf5ee3dfd27ffb01e9221592d9 SHA-256: 0455fc219a27cad8a4cae9e999b34820e756aef721e25ff2d6b9ddb6ee0f7e22
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL patterns are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coretry.ru/uplcv?utm_term=mulan+2020+download+mp4 PDF link annotation
    • http://wronba.com/uploads/wysiwyg/file/23670093497.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/96261747959.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/13894266350.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/40690023503.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/wiraterife.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/11000997901.pdfIn PDF document text
    • https://somogyplusz.hu/files/61025002237.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/46904587755.pdfIn PDF document text
    • https://atrax.hr/files/70489837613.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/taxadoxavexisuxexijen.pdfIn PDF document text
    • https://polaria.cz/images/file/2254518337.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/79173760168.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/lixubuduv.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/50353925298.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f303380474---lokujorepadijirufenejugum.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/pumabofikivazuwobarujis.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/morebamobupevozako.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/katotodasifi.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/8737049778.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/96560793820.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/kudazenawetazujav.pdfIn PDF document text
    • http://kaies.net/upfiles/file/42877418077.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/61351377635.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_off0000ae19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE19 10460 bytes
SHA-256: 556cbe3c329cd1834e0695128660155ef70e13d64fa3fa3700b9041d5ac7885c
font_01_sfnt_off0000c5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DE 17088 bytes
SHA-256: a45766b46cfb4b123cf5b38217f54fb88c30ff56e28d04de03fc026722ee035f
font_02_sfnt_off0000f1b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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