Malicious PDF — malware analysis report

Static analysis result for SHA-256 07785b02145497e0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-23 00:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78c8233b8737acd2cf919e22f25c4f5c SHA-1: 5cba1774d8faf01bbf1f3478a84e58bb73c3cadf SHA-256: 07785b02145497e06350da8e65b68eb6453d6e22b854fd0872a667179a789b32
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Embedded JavaScript and numerous external URIs suggest the PDF is designed to redirect users to potentially harmful websites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a link farm on disposable hosting, commonly used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=letters+that+start+with+r PDF link annotation
    • http://soeurs-scjboran.fr/soeurs/upload/files/kumebive.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/fuvegogedesezurosaru.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/39277018248.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/768469980.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/nazazewekokalerajobotago.pdfIn PDF document text
    • https://ratoempat.com/contents/files/63957389427.pdfIn PDF document text
    • https://truongthanhco.vn/webroot/img/files/jipewibagipasoxizogolegof.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/bajajoxabuk.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/20387806015.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/mixemupomutexagepuled.pdfIn PDF document text
    • http://hocomesun.com/upload/21146769199.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/4314999586.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/62659369612.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/jigixobajusux.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/foxiloliki.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e5843e82ca10712c425965804d908cdb/98545158009.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/92291129008.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/97216202040.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/lerelapiveviwiwatifeme.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109201719239448.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/62607437365.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/zafebez.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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 9976 bytes
SHA-256: 29344f97faefe419a4a0dfe2faf930d164103c55cb37bce4151c56e4f4c10f60
font_01_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DF 17852 bytes
SHA-256: e4105b608a3d22e4493d4f305546313656067842757bd61140f53379bb8390a4

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