Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba1cf64c8c4c514…

MALICIOUS

PDF

78.3 KB Created: 2021-03-26 10:03:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a7ec7ee981f321bf66a3b7ef74023292 SHA-1: ac3a74113e7fafe9f4c26502089d557077f39326 SHA-256: 2ba1cf64c8c4c514b66002842911b72059b37906f9e2fc95c8aa613e8d848079
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains and known malicious redirectors, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=confidentiality+agreement+template+uk In PDF document text
    • http://rexirututesopew.iblogger.org/34519937552.pdfIn PDF document text
    • http://tamazilewuviden.22web.org/brahms_requiem_score.pdfIn PDF document text
    • http://se-mrush.com/bouncer_1._5._1_apkntyrw.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/34523448994.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/balada_para_adelina_partitura_piano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474739/normal_601f613cc6879.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446390/normal_5fe401811fc12.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/semokejaxudoxe.pdfIn PDF document text
    • http://4gusevshop.space/12687600240t1v7h.pdfIn PDF document text
    • http://lifegirls.site/kenmore_dishwasher_665_owners_manualupuhk.pdfIn PDF document text
    • http://vupataxisuro.22web.org/9696765593.pdfIn PDF document text
    • http://siwupezomejen.getenjoyment.net/sap_inbound_shipment_table.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/e2716742-c3b8-4f74-a57f-01147dd066c2/bosch_300_series_dryer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d7b09f-d918-4cf3-bd18-02c734a8146a/mazagakifinaviz.pdfIn PDF document text
    • http://dejedizanabi.epizy.com/15134707484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e53d8bb-268a-4e06-a650-c5252bfdbba6/xuzug.pdfIn PDF document text
    • http://vadufitewaseru.epizy.com/roleborovasatonadimere.pdfIn PDF document text
    • http://lojepizalek.rf.gd/75500746750.pdfIn PDF document text
    • http://noderisaxe.rf.gd/97041304164.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71a39261-4cab-4467-be17-f15a2260db8e/72017764150.pdfIn PDF document text
    • http://rewelasiv.rf.gd/zexujexokuwapigepas.pdfIn PDF document text
    • http://mawigugu.rf.gd/fatf_terrorist_financing_typologies_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aac1edb-c45a-4e04-ac82-3560069d4512/2014_dodge_charger_manual_transmission.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/iodine_value_calculation.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_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 5252 bytes
SHA-256: 45d6fd5064ab1866db2965d26b194dbbe816e8b61c3739be74bf283a7cece033
font_01_sfnt_off000106d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D0 10748 bytes
SHA-256: 0818b55136f16ac34aff52a4bc103abfec11ad60ba2836e7ddffc005abfff6b6

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