Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4169c4290d3b850…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 14:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b60a04b57aaebb67012a7e221093019 SHA-1: 8098a213df30e9073c6dfecd634fd2ecd1d11588 SHA-256: f4169c4290d3b850d1d2716afb5bef54a03ce5fdad01b7d438acac0f0b67b0d7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to phish or distribute malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, highlighting the use of disposable hosting for a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • 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://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413f504bb63---xazoxebisirosedixutikozir.pdf
    • http://studiostocchi.eu/userfiles/files/73145787721.pdf
    • https://basisangka.com/contents/files/18833589479.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16130300ca24a2---31843423412.pdf
    • http://rickgrisolia.com/userfiles/files/nonoboxibevuxowosuro.pdf
    • http://jedwines.com/cmsCart/upload/file/sizasiwejiwurokebifi.pdf
    • http://daoltrading.com/userData/board/file/58985164147.pdf
    • https://cuisinescartier.ca/upload/editor/file/memoda.pdf
    • http://interroadholland.nl/userfiles/file/juwakemawibixuvedit.pdf
    • https://leosservices.com/userfiles/file/62333346571.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/7466657674.pdf
    • http://boschvietnam.vn/files/usersfiles/files/josaguxabidemajileretaze.pdf
    • http://niezapominajkowo.eu/userfiles/file/45653007212.pdf
    • http://universalthailand.com/images/uploads/ckfinder/files/dowemumedozirimudewipo.pdf
    • http://headlinesdinerla.com/uploads/files/75861349465.pdf
    • https://photofetimages.com/19952066100.pdf
    • https://evermoral.hk/upload/file/1631147191.pdf
    • https://commonwealthsportsawards.com/userfiles/file/vizejiwowedak.pdf
    • https://bunian-co.com/other_files/File/86119695028.pdf
    • http://montex.pro/uploads/userfiles/file/zetodomuwazula.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31538284700.pdf
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/gufenoworug.pdf
    • http://npas.ru/pic/file/gesowaturuluf.pdf
    • http://tanriovermensucat.com/uploads/genel/files/75867159440.pdf
    • https://zilalcooling.com/other_files/File/lubakem.pdf
    • https://profitaler.com/UserFiles/file/13291969658.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mobile+legends+bang+bang+bang+bang
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 16792 bytes
font_01_sfnt_off00010509.bin
1175a350da8b045ffb2346ae8914c28eed11dc48f157bdb37d88b6c923631940		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 17724 bytes
font_02_sfnt_off0001333b.bin
6e46931ec550c19fc6babae2c80786a936d5a0916bc7cfe1cbc3fae952d2857d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1333B 10356 bytes

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