Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9daaa0986148f01…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 07:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 08ea5ffe65cacd6c9d5c320feb7c03b9 SHA-1: 430fd4e04588f833ba008ba433eaa2ca45491a7b SHA-256: d9daaa0986148f01509254491a1778ac68bab8b9ab419cead2d4050cae0ea2a3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The presence of numerous external URIs, some pointing to potentially disposable domains, further suggests a phishing or malware distribution attempt. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://sxhk365.com/uploads/file///sebolagixewixadonetirolo.pdf In PDF document text
    • https://emenu.hu/editor_up/99090918011.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/84480088229.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139140de2763---fisavelagosolizesinulok.pdfIn PDF document text
    • https://phm.vn/upload/files/93544721729.pdfIn PDF document text
    • https://frisch.ro/files/file/95490533249.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/36899869015.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb8f8d9a96---lufebe.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090319302273499.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/pagiledub.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/nesumawo.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/wusuvabefusekeza.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/girorozukitetazivegofuwo.pdfIn PDF document text
    • https://westhygiene.hu/editor_up/35578744658.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/76544776763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=multiple+button+android+studioPDF 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_off0000d77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 10620 bytes
SHA-256: 5fd059c94af30cee4e1de549dda3f5c016d0414096c7ff93c35acff76089e7e5
font_01_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 18328 bytes
SHA-256: c057f1249c98be7857a73ea7cf62b5bb2fa69611baed8002a6aeb1a467c0d09a

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