Malicious PDF — malware analysis report

Static analysis result for SHA-256 9619cd51de1901af…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 14:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e14ea6587920f98207189345bbd6dd1c SHA-1: 6957d34ce8945cf942b3205f4fc3a749aaa6a730 SHA-256: 9619cd51de1901af147d2ad270f7d6b8179bf24cb86525c0f4e6f88c03f1e901
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=bollywood+movies+watch+online+mobile PDF link annotation
    • http://ranch.pl/files/file/rubivela.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/37924611548.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/weratapuvapipeb.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/sudidovinabokoxuro.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/wofibanelopotidokawiziwe.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/robizelupujukakenagibivud.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/99274364881.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/14403612823.pdfIn PDF document text
    • http://fteq.ru/files/file/26488693882.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406b7c97d2b---rerolawofilebiwi.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/gezaxukilozawog.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/kosono.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/54101139093.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5b2cd1f37---pupenujopidavo.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/velavefog.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/49852833816.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/jusegatifomopujezekarolu.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/1373180069.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/76141386078.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210906011741.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/2761991379.pdfIn PDF document text
    • http://hadt.vn/upload/files/sojenagutibemozoxelor.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/75855397204.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_off0000b206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 10992 bytes
SHA-256: 1356b17ae8accb6f982cefd035220f5e0153db01329a6cd58aeec2714b0a97f6
font_01_sfnt_off0000cb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB74 17100 bytes
SHA-256: 73b944dc809592e5c2775cd47a4429f70ec641876fa2ead3400cda2c71a3c892
font_02_sfnt_off0000f6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1