Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a200b916355a3a…

MALICIOUS

PDF

74.2 KB Created: 2021-09-08 12:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee71ac19e43c8865e9ee03e571390e86 SHA-1: 47dc475f56ae116e3fcd1d7430b9f0de5c038d90 SHA-256: e8a200b916355a3a49c553583734ac51c4b5e08189aeee78fe9e193356aa25f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were extracted, the presence of many external links suggests the document's primary purpose is to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chongqinghaohong.com/upload/files/vodijowimekal.pdf In PDF document text
    • https://n-v-v.dk/userfiles/file/2697647054.pdfIn PDF document text
    • http://renknh.com/ckupload/files/88724501071.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/kimavimije.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/35117098090.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/dumajotunifuxefugapini.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/turexagukijadumarosijeg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136463812f9e---pudemoderubatibexaz.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/6770222822.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/tilox.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/padedozopixiduzotibozukud.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/61723658659.pdfIn PDF document text
    • http://unitec-egypt.net/userfiles/file/41154133103.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/vezirorugipazodusa.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/jemed.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/xifagagopewelag.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/94796777925.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f1f09efce---7182297573.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/83597074648.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/73903647203.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/4418590208.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/42548607869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=manual+de+identidade+visual+prefeitura+de+s%C3%A3o+pauloPDF 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_off0000b9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 18284 bytes
SHA-256: f471d669016319bb39d8c71596bcdc7b871be84610dd19a0fc70ab46c85ca040
font_02_sfnt_off0000ffa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA6 10916 bytes
SHA-256: 27617d25b57cfb05cecc53c6a93150753c888cba34fd6686fcd183dffb9dc808