Malicious PDF — malware analysis report

Static analysis result for SHA-256 1510c29d3b159f3d…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 03:37:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 12d7403806711589e5a7f61b3f000dce SHA-1: ee573a71f11de780596f7f19a3759b483acb4036 SHA-256: 1510c29d3b159f3d76924f9ee624fa659e7b24264d4b69f0d47409d838bab663
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many pointing to potentially disposable domains, suggest a link farm or phishing lure designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://geometramaurotozzi.it/userfiles/files/jilazowimav.pdf In PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/25890900804.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/44500381854.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/vokepuluxudisil.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9e6560.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/15553951415.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bitilodupezapuxezig.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/viwopudejuwefig.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wenumorepegaxani.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/mexodena.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/bobebubibuxivef.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/45594081123.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/boxivorimasu.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/42201102714.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/dewarelizefu.pdfIn PDF document text
    • http://coachhouse.info/assets/file/53665539811.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/27035803145.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/10509487968.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/21091119314049792431zu4.pdfIn PDF document text
    • http://turnyras.lt/Files/file/ropiwojirogetogorul.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/mowububaju.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/guvinawuvazotefedifikada.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/lerojoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=electromagnetic+waves+from+highest+to+lowest+energyPDF link annotation
    • 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_off0000bc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC37 17384 bytes
SHA-256: 73d94bca1b5ba6cb02a7c270c876454bc2d2b6999f78b9a9573814fedec12731
font_01_sfnt_off0000e933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 11032 bytes
SHA-256: bb24ec4281ddc5d90f9ee636367ae923d1470d8a9a23313fa05da52c4bef416d

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