Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b75d69cecf1763a…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 09:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2fbfd1115cf2b6b625bbafbdb52cc8f8 SHA-1: 09088f29a0dd8201ae34dde2f430893e9cabb746 SHA-256: 3b75d69cecf1763a1e0c350b246e93819b845c7d0f0b4a1e81aedc350c5ad79f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to one of the numerous listed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=como+hacer+un+robot+humanoide+a+control+remoto PDF link annotation
    • http://dulwichtaxi.com/survey/userfiles/files/lakubunaraj.pdfIn PDF document text
    • http://chamdure.com/DATA/files/julufawosoriduropixiva.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/02d73bg0of1aqiedjn1na551qc/nuzotovasew.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a078963ae---56613927651.pdfIn PDF document text
    • http://glassick.com/userfiles/file/65874902944.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vovitabudikolemusebe.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/tafokawilodog.pdfIn PDF document text
    • http://cissi.it/userfiles/files/bivedotizububevi.pdfIn PDF document text
    • http://molenat-energies.fr/molenat.com/images/editor/file/xakeninafeletisoda.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/gewixomatis.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wevijozenonomi.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/98455517794.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/20040307244.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/xaxadawitewepubimis.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/7618718375.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/riwubijisudakezara.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/68300981051.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/boxix.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/16263959155.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/zigakivaf.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/77900039219.pdfIn PDF document text
    • http://goref.ru/files/file/13761034060.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/zevatexanasopaluki.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_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 18656 bytes
SHA-256: ddda41c67741413f879b89b22ff3c30f27a0a2415bca2b6d61e8b4744c637da3
font_02_sfnt_off000129d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 10736 bytes
SHA-256: 82bf9e28996f8d42fa0da7e0d5e14986d6240e01411daafa5b5cbcd26d99e90e