Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e19a38e6f383789…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 18:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fcb8f598eb58e31ab2619aff823e8837 SHA-1: 3aa65c31183b79c8e05cebd11c7bf383c4f68984 SHA-256: 4e19a38e6f383789184c304f13c34c56446f71afc0499f8c7415cd76fb3fcad3
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous URLs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://cructi.ru/uplcv?utm_term=the+hundred+secret+senses+pdf PDF link annotation
    • http://wadirumshootingstars.com/userfiles/file///6366209714.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/12456456101.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/guvanumasoletasodivo.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/65964853385.pdfIn PDF document text
    • http://onlytech-tunisie.com/userfiles/file/39812920831.pdfIn PDF document text
    • https://protum.se/file/20410766705.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/28387394652.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/vixexon.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/03/susuzovevedolad.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/95709766794.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/85752494994.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/faxinejomowaled.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/53333011574.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/gotupaje.pdfIn PDF document text
    • http://brenderup.ro/mm/file/17959379785.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/rusasazaxil.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/gogosajebirotupuxugeno.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/tomoxogijasetido.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/42084701042.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/kosuratubepif.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/93727984713.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9b3e5d0a3---17533231721.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/89559418743.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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10360 bytes
SHA-256: a530ce3f517e121bab41b8b0b44fb0740b0cc60e4ed144152ca99ec1a1504a5f
font_02_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 17556 bytes
SHA-256: 93385482e27a60768464462adb8eb8a6998715cf781f02cdc9c9a2bce68022e3

Open this report in the interactive analyzer, or submit your own file for analysis.