Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6bc1fbd1e9d4e7…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 00:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f59e38e4af792570012762ba99cfaa0 SHA-1: 91475fd2de19a4ad8892fb03795e5b685291a583 SHA-256: ca6bc1fbd1e9d4e7c20f9607cb7418c8bb6446ca0085392d369677098c0c7592
126 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating it is a phishing trojan. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting an attempt to redirect users to phishing sites. The PDF structure and the presence of many links on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://drafthe.ru/uplcv?utm_term=vr+dead+target+mod+apk PDF link annotation
    • https://r4binsh4h9-att.com/contents/files/13422093224.pdfIn PDF document text
    • http://canvangdientu.com/images/file/68307676123.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf1451912---pobunudiledogorokazelode.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/22497013241.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/solulibut.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/55922053784.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/2662909277.pdfIn PDF document text
    • http://lecostationery.com/files/file/jisotupodusagipun.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/mopazelivose.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/4771721052.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/sixogu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/kegememubafogakajo.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/besigufalubewaniwamaxes.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/vunug.pdfIn PDF document text
    • http://czyxchem.com/upload/files/45476488144.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/7653613963.pdfIn PDF document text
    • http://hycxchina.com/filespath/files/20210904142731.pdfIn PDF document text
    • http://zaiger.ru/img/file/55575739488.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/90353051862.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/posujojogose.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/buvatosetiduxok.pdfIn PDF document text
    • http://prestopc.it/upload/file/pogometibad.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/52188326077.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/vulakajanunijuv.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_off0000c327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 17496 bytes
SHA-256: e5bcc86cbbffc857942ce360c1c41148a6ab33944325bab4472fb6e75cb1fdd2
font_02_sfnt_off000108da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DA 10384 bytes
SHA-256: 3672451b1e19659e25592d361d52ee933917f7e69abcb5e94a1a65bed7b2d596