Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bb5d0cfa1ced26…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 11:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e82de6d885a806231ab940b01ad03979 SHA-1: e07c3a9ccb4f85d1a6349f8b39879245eacbaa05 SHA-256: 97bb5d0cfa1ced26c7f994bbeffddc8a084c82c2bf9383418e57de5a942b36f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are structured as link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=bulk+delete+apps+android PDF link annotation
    • http://selfmadefilms.nl/userfiles/files/tibojuzisi.pdfIn PDF document text
    • http://willajarmar.pl/userfiles/file/wugugidak.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/nawexonunoxekewotofebe.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/99942281607.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/22054639738.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/81415306515.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2c810f6d4---wepov.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/75798209270.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/lixabidarorikisam.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/82809665258.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zizutevazerolezopedof.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/72282150396.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/56591727820.pdfIn PDF document text
    • https://chorland-dining.com/webroot/editor-uploads/files/gevuduvaximavo.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/63072063056.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210915181020468.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/mopozenizujewozukese.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/ruxebifodorapowolusa.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/09/77669816854.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/jexijipevajidofokukav.pdfIn PDF document text
    • https://everestart.com/images/stories/file/77973646602.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/jepapubobaw.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/67647084106.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_off0000da16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA16 18052 bytes
SHA-256: a013621947ea79266ced37e6c61f880e84258dfdec978edfde1f620ea54859b8
font_01_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 10632 bytes
SHA-256: 4c722e60cc39584569cc7319c797f1ea5c800ee7cb33f158d0709e4d6bc19c87
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1