Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ab9157c82770ee…

MALICIOUS

PDF

73.3 KB Created: 2021-10-02 14:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ff6811cc42de4e5cee595ad181bf4ca5 SHA-1: cb97d2fbc0af482919a2f30158451fda7f0447e7 SHA-256: 75ab9157c82770ee11c30b84d3c4d6f514e1bc9123f204afd86b1801336d42cd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to potentially disposable domains, further supports a phishing or malicious redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gardenofsound.com/userfiles/files/46959838866.pdf In PDF document text
    • http://santamariamikado.com/uploads/files/61995220012.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/73315506771.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/39616786407.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/938688eb54547d809f4ab0dee9b01091/panujoporufeludijozavit.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210916_011758.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/dibijexewinaj.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/68517955009.pdfIn PDF document text
    • http://dsagco.com/Upload/file/latozefik.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/nokane.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-27/images/files/tafijosokulazufelu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/73690466792.pdfIn PDF document text
    • http://decentlogistics.pk/survey/userfiles/files/muzavafijemagiwojinu.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/xumufivuwipulonemuroriso.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/pireb.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/pusewegotiniwilatunajiwar.pdfIn PDF document text
    • http://street.bpv.su/content/files/files/70223275179.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/17240154831.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210921110500.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/zotagupera.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631076181.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021090918494746.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/10416778616.pdfIn PDF document text
    • https://artenika.pl/fck/file/laxesusafijexokala.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/dosalidamux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=remember+the+titans+movie+questionsPDF 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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 10824 bytes
SHA-256: 45d690fc953644fd028f1d232c9371d6e7c677c2286f48ef2aa350c2cbb3fef0
font_01_sfnt_off0000cf85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 18412 bytes
SHA-256: 8fe005180bcbbc4767427372541b61c8ef0c41d019e4b9a3526a4c227cf9e39d