Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3b11016d6818422…

MALICIOUS

PDF

77.9 KB Created: 2021-09-26 21:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71f1c1ef5b24b123228640044b5f9629 SHA-1: 9b2f44cee7eee6d39a66476396cdf4e3933e90ac SHA-256: b3b11016d6818422546ff3bbae22e64f58ddea69c8e6f44825318821c68ce355
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, reinforcing the phishing or malware distribution intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8006

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 https://irlanc.ru/uplcv?utm_term=conquian+estados+unidos PDF link annotation
    • http://portaldo.eu/contenuti/upload/file/97918860190.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/36882503049.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/dodapawugirezilasutomu.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/9965879649.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210915/file/35590458437.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/lorojujazubugawekenibe.pdfIn PDF document text
    • http://aurora-c.jp/files/files/44875458858.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/56353198051.pdfIn PDF document text
    • http://carbonelite.ru/file/zimukenarewu.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/mamigiliva.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/81701427180.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/jizukizobotuge.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/sokakeduwud.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/65158666070.pdfIn PDF document text
    • http://miwon.com.vn/app/webroot/uploads/files/73122820992.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/db1f1e8c3e42a551f30e9161ee2adbfd/65410095159.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/lobizetawexagukokub.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/sedab.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/97559477796.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613134dbb9a2b---29961125598.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/juzilanabutu.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/5379079869.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/likubefutivu.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/98749031281.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/wugakuxagilukupaw.pdfIn 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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 10372 bytes
SHA-256: c6eae017b408ede58e0fd10f63df6464a9fc715b5b0b4313b7c97f4f3a1b4d6b
font_01_sfnt_off0000e057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF869 21768 bytes
SHA-256: e830ed7ca71c172dfc66bcc6cd257cdbe464fe9bbfa9e926fd88fd6647b753db