Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed38fcef18bbba4c…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 16:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7b082a4732117c0d098462cbe305de9 SHA-1: 8f6ea6270b59791028b701b82889b36b608d6909 SHA-256: ed38fcef18bbba4cf812f862f2b7d8f634034a460e5ad69ec28cf52a35bc45b3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. The embedded URLs and the PDF link farm heuristic indicate a strong phishing or malware distribution attempt, likely disguised as a software crack. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://inwebjor.ru/uplcv?utm_term=crack+office+365+product+key PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614f20eb2096f---70729881489.pdfIn PDF document text
    • https://durimawar.com/contents/files/77900462233.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/kewifafomuromawerobikol.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/40965193335.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/ronugipupofutuxiv.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/dututa.pdfIn PDF document text
    • http://dongphat.net/upload/files/saxunuru.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/zatepimetofomovete.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/xojoxopisekizajida.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/76245429445.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/tezilagawa.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/koduteduxez.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/novatonas.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/96674105141.pdfIn PDF document text
    • https://baldai.manovonia.lt/images/files/148406605.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/12609399947.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f85d30dd---58842554304.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/neratugomegasewizeve.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/sikikonudakuxivawemikavim.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/falotes.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109100824188787.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/sisuzosodinufu.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/9617913615.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210923062602_1403194885.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/zixinenegunexelifajofi.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/85426275616.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/62244080609.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/12094184851.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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 14948 bytes
SHA-256: 0205110fa74e8a8bc89ec749297b279ad17dff4ed4f62ebebc646267eb970037
font_02_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 11104 bytes
SHA-256: f0db189837f42b1fe6c3a844c57bfe7897865d49b044f8c4c02070c0a713148d