Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac210693077e2de…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 07:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 25f7e31665a34af9155b4675864c88e0 SHA-1: 16974ee32d7ad8e33e0e5a6990767d5dedd9ea02 SHA-256: bac210693077e2de5e6ac0743c45b71a0f68464eb538ececc3ff80dd9e819916
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=good+words+for+the+letter+r PDF link annotation
    • http://www.anclupnapoli.it/userfiles/file/detula.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/kuroboguvilif.pdfIn PDF document text
    • http://congtyvima.com/images/Download/xefek.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/tusupugimejikazavo.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/potonador.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/92600260752.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/kakiseluwakedig.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210910_C1094D7806AA828C.pdfIn PDF document text
    • https://mkontakt.com/dat/file/8977293495.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/54526712988.pdfIn PDF document text
    • https://bor-diing.com/upload/files/72680718751.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/risatobujiropifijugopima.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/96106169115.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/92618341213.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/7850574777.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/24592989154.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/feditugalumulujosumeduw.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/28944970140.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905051351994896.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/39143402509.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/70687265249.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/lolofep.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405ed896766---24166493052.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/89376545501.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_off0000e0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 18004 bytes
SHA-256: 6c090890416dd39231bfdf4227a510e3ed03719160c44bde1d330495d4eca0f5
font_02_sfnt_off00012772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12772 10216 bytes
SHA-256: 687eeee7a5ca2923282fe3f0c2a7ce991592b1b884e771ebdd2a82dc90b4657e

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