Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd95fcda592911d5…

MALICIOUS

PDF

78.9 KB Created: 2021-09-20 00:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da9ca261965c3192c0e764336c792ead SHA-1: 68c1d0c7e8e71546a59d2bc415eb746ff7812315 SHA-256: fd95fcda592911d50ba79774cc4c875589b21815009de7471c220cef47e21d78
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which are on disposable or link-farm-like domains, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrustworthy sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=crdg+physics+book+pdf PDF link annotation
    • http://goddesshair.net/upload/users/files/duvomudodovenuleve.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/39164265840.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/7122314742.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/26239010338.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/67396192845.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/65008615614.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/25238531398.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/jetokosixevinoxi.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/taxutumamobuguxifegiz.pdfIn PDF document text
    • http://www.uds-myanmar.com/image/upload/File/44418650655.pdfIn PDF document text
    • https://0900107678.com/upload/file/51579628862.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/kuvavajupozajuworatimalo.pdfIn PDF document text
    • http://ipublicity.cz/data/file/wesijegovikodasatifitekaj.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/24854131833.pdfIn PDF document text
    • http://specialcats.nl/media/files/94585448814.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/13232614616.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/kutupevu.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a6d727461f42ee52edb2a0ea8197f1ab/fasuxoxibatadebop.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/lanuwa.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/43576693238.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/8066494311.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b59d7b5a3a---golibopetewevaledepijis.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_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 17744 bytes
SHA-256: 56fbd04cab7d67ee4e12eb6c089668f7c1042b947fe7087fcd87b1ac2410ea02
font_01_sfnt_off0000fdc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DF 10736 bytes
SHA-256: 3921e43b3f74fbb5c5a918f880c6afb03b6bc046c2b5a2989497d71644a24167

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