Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d76d6d336dd3cd…

MALICIOUS

PDF

69.5 KB Created: 2021-09-30 21:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 98b63ec33dc724218f57bffe91cf9189 SHA-1: 9be39b6080708a3fff258917a87dd5b7c5117379 SHA-256: 30d76d6d336dd3cd54f2df9abe0550f9be227d9ecbd2fc7ebe689291d53d481d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or unwanted software. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mondoaudio.it/img/uploaded/file/tizimewopiganipev.pdf In PDF document text
    • http://d-innovation.com/upload/files/35957261906.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/zibuzemalo.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/24058470745.pdfIn PDF document text
    • https://letstravelforacause.com/miet/assets/files/retopixike.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/sutedojonepefibaf.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/rinibun.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/5029718747.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/lidumudujasifof.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/resofope.pdfIn PDF document text
    • https://sainaudit.mn/File/99628847043.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/37457522366.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/vesirumufepuvifasafidik.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/18140670502.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/56444741331.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d985199b---nigowosasosafikixigune.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/84708017104.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/fupetod.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/wolezugufuga.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-29/20210929123031753464.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/resomilidas.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dunefikimu.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/motuvukutegikif.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/zimatuwugajubofebogoxupib.pdfIn PDF document text
    • https://binhvi.com/upload/files/74976399908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=flash+download+for+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_off0000b43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43D 14712 bytes
SHA-256: f4372f6b8d1f0d1921882c8b9450f72effcfa6d78723a106247f6f1a3d8d15d7
font_01_sfnt_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EE 10284 bytes
SHA-256: 8b5e7a1e013dd94e1211a3cf839a61f71976869da4055275c0cbd0e34e03921d