Malicious PDF — malware analysis report

Static analysis result for SHA-256 55fb07e08d34e718…

MALICIOUS

PDF

75.6 KB Created: 2021-04-01 00:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b8481a4c3a6438245d12524de59f8a81 SHA-1: b116b8228214238aee5530f236c81a03e695e6f4 SHA-256: 55fb07e08d34e7183defbf8a9d03dbc22cb6c93cdd6b3b1d6665d8d0fe41dc18
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of such domains for potentially malicious purposes. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/award?keyword=nccn+lung+cancer+screening+guidelines+pdf PDF link annotation
    • http://kazaxukiga.getenjoyment.net/agenda_21_global_resumo.pdfIn PDF document text
    • https://rigopijifotifat.weebly.com/uploads/1/3/2/6/132695828/8061045.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495974/normal_60034653d8962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484812/normal_5ffa612ba348f.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/jusoged.pdfIn PDF document text
    • https://regapopuro.weebly.com/uploads/1/3/5/9/135964604/462b59f0c8.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/jcbe1jc/xolotisoronusilel.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/full_forms_of_computer_abbreviations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481423/normal_604f1e5926e37.pdfIn PDF document text
    • https://cdn.sqhk.co/gubusase/BNiaAjg/xarelto_copay_card.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_6025e54b40137.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/jcf7hdB/file_manager_app_mac.pdfIn PDF document text
    • https://leviwajij.weebly.com/uploads/1/3/1/6/131637177/zizawo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391009/normal_5fcac19b41471.pdfIn PDF document text
    • https://cdn.sqhk.co/zokosofu/jihdrii/under_seat_storage_2019_chevy_silverado.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f09eee-a4fc-4501-a6e3-bb1870ad9de6/85357211811.pdfIn PDF document text
    • http://gajopule.myartsonline.com/3696256171.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/zatanura.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/jukofizizuxow.pdfIn PDF document text
    • http://jajogagek.atwebpages.com/27673319809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d659946-e03d-4ac4-9062-6dad943c08f2/mupupavixavavolamofovap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac94cb7-4ac8-4617-b9ce-7989fbe9f1e3/ion_idm02_electronic_drum_set.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7022764-258e-4147-981e-67d58180e7dc/scout_log_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10d84296-cd7a-4aef-b005-a84fa04a81f1/98588144774.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/43892846190.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF8 5292 bytes
SHA-256: 7802d02941ed0c54595c099488e0644f6266c86b6ba6d5d0f9d963db7ab4fd87
font_01_sfnt_off0000fd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0F 10520 bytes
SHA-256: 08739ef5f9c0b9464ec32bd62dec4adc59934a50e36ffe7e28c8199498ebb6d8