Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a14abf0449307be…

MALICIOUS

PDF

72.4 KB Created: 2021-09-19 09:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af74b6d56e925bc8b4d542df9fd83256 SHA-1: 88b597ae6b8a06dbd68e43f984670a8f3af4a9d4 SHA-256: 8a14abf0449307bea891d0459211f204bf3c6f04dddfe13dfc76ed52d5c59ab0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm structure, suggesting the primary purpose is to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://fongyoskert.hu/userfiles/files/medagalojesoguxi.pdf In PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091807505973499.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/16881711437.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161466e25ca3db---31111509662.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/86424162344.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210906030750_2042476743.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/xuladaki.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/pogabufivapibikasujel.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/tumawudedu.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/logezazeril.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/kenafibe.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/mupibokopukulovarem.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b999d8d53e---78267138106.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/61774721359.pdfIn PDF document text
    • http://khmim.com/ckfinder/userfiles/files/xakimetezivolalitobumim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=shadow+fight+2+special+edition+hack+android+1PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/daxewinunarojopeko.pdfIn PDF document text
    • 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_off0000b736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB736 16480 bytes
SHA-256: 14aa38e7a042a5e5b8b4c7d111643d8db3ea3fe48bc75c44b718d3f910c0f39b
font_01_sfnt_off0000e19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 11324 bytes
SHA-256: 1f0ea6da645287b7b083cd9304f94260e7cd0da302a3e66082f2f4070ae16a6d

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