Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb10eb6b8eca780…

MALICIOUS

PDF

88.6 KB Created: 2021-09-10 23:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6173c1003ab1447d2bf6e6e7d858a1e SHA-1: bb5b7f97e2d154cdfb670d701816ae0207f0bedd SHA-256: 5fb10eb6b8eca7807bf26a9fe8293922306debdf1998b83750dbe4fcafb4e4d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://cructi.ru/uplcv?utm_term=ps+plus+generator+2021', suggests a phishing lure related to a "PS Plus generator". The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=ps+plus+generator+2021 PDF link annotation
    • http://gddfboiler.com/uploads/files/zulikofuxeto.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386f7614dd6---telewezowabuzimakap.pdfIn PDF document text
    • http://opersan.com/file/lezudixaturipo.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210910_2140ABA655E34DBC.pdfIn PDF document text
    • http://dsfly.com/uploads/files/32083045731.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/58574569909.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/tugejutegaz.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/punuwavagare.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/88267336669.pdfIn PDF document text
    • http://thevalleytrader.com/files/20385216127.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/73014974028.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/porefekefepe.pdfIn PDF document text
    • http://ombs.ru/uploads/files/44883423755.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/43735446319.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135918456c46---jowubave.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/jigijibovavurofuxojafo.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/81274593846.pdfIn PDF document text
    • http://strap.sk/uploads/files/90515300983.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/wuwesuvefosuxijosaweku.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/21091009160768718770u16.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/4039850471.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/xijugutojenuge.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/40040922703.pdfIn PDF document text
    • http://rsentco.com/upload/file/42672482293.pdfIn PDF document text
    • http://vln.nl/files/file/kefawigoxisoliwir.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_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCB 10728 bytes
SHA-256: 986e377ae6d30a4f66f977395b96e566ab98b93dd8d045828276825bda269cf4
font_02_sfnt_off000125af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AF 18296 bytes
SHA-256: d155e8f9626f1968ceaf9fc241d95283324c38f3f6cde9934175a08df553e3bc

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