Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfa4a8b19357056…

MALICIOUS

PDF

84.6 KB Created: 2021-09-13 00:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 064a5bfde5b0eca7c118a429f4bc2fb6 SHA-1: 62b5986c2a99d5605ded505de7fe8ef74f149653 SHA-256: ebfa4a8b1935705637f225c5b9121ec38f99e9625fbc1cfdc56b7637ae4e32ce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ambvetbrashersclavoghisu.eu/userfiles/files/45095158626.pdf In PDF document text
    • http://thueotodn.com/uploads/image/files/jiwakuranejexifefebuxon.pdfIn PDF document text
    • http://szwygs.com/upload/40009048349.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/60765990159.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/12046634567.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/22563876872.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/39565861191.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/71003652443.pdfIn PDF document text
    • http://industrialdevices.in/uploads/66989510479.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pebejalo.pdfIn PDF document text
    • https://ratodua.com/contents/files/65029374430.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6c5a7a2fd---xubijojafirudisurobir.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/lebisuzuroxujelade.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/xisibatogukimesoxe.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/widupagamemofiveriw.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/fupuvipojixorafetuje.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/45881809085.pdfIn PDF document text
    • http://bulmarconsult.com/files/zafojexegepavusifi.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/nidamavano.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/vevidowadupuvonifux.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/36174313166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=48+laws+of+the+game+pdfPDF 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_off0000e395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE395 10924 bytes
SHA-256: c6d229790228286390fbccd96715270e0c3c3d0dd06c31f2c58abd7a40724a0d
font_01_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E4 18760 bytes
SHA-256: 2595f1fbbce061de6ef02dafce82fa927053870f9d3d3b9d7c9d7d7a73f56214

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