Malicious PDF — malware analysis report

Static analysis result for SHA-256 2134e71eced8cf0d…

MALICIOUS

PDF

85.4 KB Created: 2021-09-24 06:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 68b3586d06f38d62d1a26c47a0279676 SHA-1: 435eba5f6f7b0dd9300fceb1cb9988494e990fa2 SHA-256: 2134e71eced8cf0df61b489642a10616899f87f6c15b9819e1a683310044ba78
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and configured 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 PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=android+auto+app+not+working PDF link annotation
    • http://compagniaviaggi.gattinonimondodivacanze.it/themes/userfiles/files/1390800842.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/20143710076.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/53225424490.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/woweliviridukasuperubeje.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/dezolajozar.pdfIn PDF document text
    • https://mimpidia.com/contents/files/pikavukupokonezupowizowot.pdfIn PDF document text
    • http://kidzcastleschool.com/singhania/downloads/file/80627656767.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/3027630612.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144442e99371---38286317027.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/48052998503.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/68364259175.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/28293010697.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///sabikozezazarevenulo.pdfIn PDF document text
    • https://sunrisemotelbellevue.com/nbloom/fckuploads/file/pabejosuwifenuzeveg.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210911192905.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347e00be7f7---5227456460.pdfIn PDF document text
    • http://parquet-cortes.fr/data/Files/vobolid.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/jakowafi.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/dikinal.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/fujozaniginewuvubuzuzezo.pdfIn PDF document text
    • http://app0.linkeo.it/ckfinder/userfiles/files/boribapop.pdfIn PDF document text
    • http://iucecb.com/files/file/laluwe.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_off0000eb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB06 17436 bytes
SHA-256: 38725c2b41b25c47cdd8e715e894777b6c50f2fbe5021dcab868e17ec0eee20c
font_01_sfnt_off000117f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1300F 10480 bytes
SHA-256: 675e2a04164b1badff1c515bd31cc6875993fb438ad0267f73c6fe8c27940337