Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b78d481e785af73…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 08:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d00971ebdb3626306b330c5b15bde2c SHA-1: d49603f8ea520750623a145ae3dd6005fb0e1f9a SHA-256: 6b78d481e785af73730e4ed6e96f4d0003e2fc1c53eea7b7c735241da1bccc6b
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 potentially malicious or link-farm sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute code, likely to redirect the user to a phishing page or download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2eb63d92929b5c7f001a6fd5a06ad7d6/45188544291.pdf In PDF document text
    • http://studiovalentini.eu/userfiles/files/80910381433.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/nenuxujabovufukulamu.pdfIn PDF document text
    • https://hsse.cl/files/zifegidolesejovizalesom.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/58571179815.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/73240436729.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xigil.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/riguduf.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/93b25ee6eaaa6efb60492b5a9a181cca/difizup.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/96451542348.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/zisisasaraf.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/31014625399.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/sarubuxelavisof.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/97747843192.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/52147138486.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/baxap.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/xigixegijubotavorip.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/89345995736.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/lilimagiv.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/3905459811.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/76120169713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+disable+autocorrect+androidPDF 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_off0000e5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 18820 bytes
SHA-256: 888f2ac1093f451a2800a0f2895dff5aac04ab912ad5f44634f5be7c20060944
font_02_sfnt_off00012f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 10680 bytes
SHA-256: d678554786aeb8848712a3b1ef382f154ba4d6199ab7f6670d063b7978f92966

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