Malicious PDF — malware analysis report

Static analysis result for SHA-256 a78d656f3ea0f8a6…

MALICIOUS

PDF

69.9 KB Created: 2021-09-23 02:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1aa0c463e65a3c506cf5e974743fbc09 SHA-1: ec55a1d3d83d1af9fb4d25c3b2f05d5e5f2455ac SHA-256: a78d656f3ea0f8a68df10190cb324c1667bf56d54fd11a9b361be2edd137083a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites. The document body was unreadable, but the overall structure and URL patterns point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=hack+do+fortnite PDF link annotation
    • https://samoinstitute.mn/uploads/assets/file/84781567688.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/mixezijovetik.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed8b232d7c---visinupanifeluxodenufena.pdfIn PDF document text
    • http://wildzipper.com/clients/wildzipper/userfiles/file/6487962449.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/zekak.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/torebagoni.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/zireg.pdfIn PDF document text
    • https://krossi.ru/images/content/files/xagemejugupufi.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gogot.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/92356832257.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/bubivinofodemubopijozenud.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406325169de---58401266184.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/ratejazusalebimime.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/13560848329.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/58643132197.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/sowonuxumexogogekefamex.pdfIn PDF document text
    • http://totoumi.jp/upload/file/juwaxetifafotejisawan.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/29776267314.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1632322034.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/fogolutufivoxum.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/pimububejisobavoraguzunun.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/569439070613081ae0b973.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/39180863457.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/54155723395.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_off0000b49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB49F 10340 bytes
SHA-256: adfed065b008ceb4a7ff41e4d766d29b1050fb737b4a8a503bd8b5e9f5159bd4
font_01_sfnt_off0000cc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 15088 bytes
SHA-256: 92e2c787c4caee44951885d8c9488b9d0a8d45fb0512229d3f882bfd40e9cb50