Malicious PDF — malware analysis report

Static analysis result for SHA-256 57586239699f84e7…

MALICIOUS

PDF

77.9 KB Created: 2021-09-16 01:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1f546b2ee7094e92001fc2e415bba713 SHA-1: 4848972910df0852abee2400d416709421f0b5b7 SHA-256: 57586239699f84e7520765310de9a408e9b2c167f20f54fcb7a1c8c95809b70f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and a high ML score, indicating malicious intent. It contains an embedded JavaScript stream and numerous external URIs, suggesting it is used to redirect users to potentially malicious websites. The presence of a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=introduction+to+organic+chemistry+streitwieser+pdf PDF link annotation
    • http://architettoangeli.it/userfiles/files/15082066656.pdfIn PDF document text
    • http://www.moyekolodin.com/files/15115763097.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/17960770655.pdfIn PDF document text
    • http://yuli-china.ru/d/files/lopivir.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/48920198261.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/91188476904.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/sexavemixowenujazanem.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/115268946.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/xulugodunagosanijamo.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffcda3460---26051284852.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/62418346798.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/kemewos.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/wutumolazobosokedowa.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/95683358892.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109011131414264.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/zutofinosuwaranigazadis.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/fotujojigezupilumub.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/92412410390.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/74690603381.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/34579091703.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/31265468583.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/61159224278.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/lakup.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_off0000c37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB93 11272 bytes
SHA-256: 56f467782917d4d6d52f5057e564e6f981a3d805d4c00b5210e810857ff91a1b
font_02_sfnt_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 19488 bytes
SHA-256: 6638fbd6e4cb75fa71d2a2dc0a5b98209a9abbfb5ce8fd08abbfc74b611d3605

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