Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8e11d23306a86a…

MALICIOUS

PDF

76.5 KB Created: 2021-09-25 13:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2b11f264969c1ce3bf98617daa4c6883 SHA-1: b6b18aedfc5f509251c8fd601da0ae26958c00eb SHA-256: fd8e11d23306a86a2ffef2701a7f232b9587083bcb41e55bcd7beb7719754e5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with heuristics identifying it as a link farm on disposable hosting. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://393citizen.com/upload/files/nunifopudepuseno.pdf In PDF document text
    • http://pileki.com/imgup/file/19448693899.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/88784502188.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/21503790488.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/32898102649.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/18076209276.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/66486637882.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/74e634f258e66ca0dfd0ab86161b43c2/90441953462.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kaxumadubidozojiz.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/zovar.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/50758405699.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/93917400710.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fadosebowipa.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/72777062509.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/fagaminajipuniri.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/patakufejerazidapo.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/75993850571.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446dcdd197f---12442091505.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/wunorapuberedidowiwasol.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/volasodezipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=hlengiwe+mhlaba+songsPDF 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_off0000c00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00A 20276 bytes
SHA-256: 4e57e6a70a749ea0f187953474e01405d3660ab9b0d209f69d2ed44a915fb39b
font_01_sfnt_off0000f4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 10572 bytes
SHA-256: e129559e6e3f28608026ac035d3834c5eaeb79ca1b38b90e12e88d46521bfc7a
font_02_sfnt_off00010cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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