Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b786d0280e19897…

MALICIOUS

PDF

82.3 KB Created: 2021-03-27 21:15:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a11fcdddb697fa98649ec4410678723 SHA-1: ad39b1f782c93c67e1c1057866bbb7b11af0c9b8 SHA-256: 6b786d0280e1989724513cee6802242886dc8a4f05c05431c97971fe826f418b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, particularly to domains like 'jacksth.ru' and 'feyakast.online', suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. ClamAV also detected it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=posterior+fossa+decompression
    • http://feyakast.online/balixotexufosovifztfxt.pdf
    • http://sodaapp.club/rilowozudoduwepot2uyu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/kakekojezutok/14861323755.pdf
    • https://s3.amazonaws.com/jodabiladezot/grade_9_math_test_with_answers.pdf
    • https://s3.amazonaws.com/wupiwupiwot/3d_wallpapers_for_pc_1080p_free.pdf
    • https://s3.amazonaws.com/tinivukedeta/sagatuf.pdf
    • https://s3.amazonaws.com/xamibebulosaxug/2010_camaro_2ss_automatic_specs.pdf
    • https://d62ff7d9-aefc-4ab8-8cdf-af38868aea16.filesusr.com/ugd/54b9a1_94b3b4edd7f1435f87036cc2755d7cf0.pdf?index=true
    • https://s3.amazonaws.com/gaxuremewuger/metro_2033_redux_library_guide.pdf
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_eb3dab2275824546b08a575bbf0cb1b1.pdf?index=true
    • https://s3.amazonaws.com/dobesogum/bhagam_bhag_full_movie_in_480p.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/service_delivery_manager_interview_questions_and_answers.pdf
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_e7be65c178d74fe89da6156d1caea287.pdf?index=true
    • https://6552665f-f3ce-4070-9f47-7b493df4570a.filesusr.com/ugd/3d88c7_b8bcf616e121458db9f33212a157b797.pdf?index=true
    • https://s3.amazonaws.com/jixeremipet/jeduzamad.pdf
    • https://s3.amazonaws.com/lanaladu/maintenance_report_document.pdf
    • https://s3.amazonaws.com/sesijesule/sisodezorewufefiduxenina.pdf
    • https://s3.amazonaws.com/gagotaniwipure/givozapuruxeluliwusuzu.pdf
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_c425871d3ebf450885eb8cb54200e94f.pdf?index=true
    • https://s3.amazonaws.com/bawalidamovidud/hotel_management_business_plan.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e4.bin
cb7aa0660241866d328da7512bdb17d0201bfe3ae95116226cefcb08b43c9eee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E4 5060 bytes
font_01_sfnt_off000107f4.bin
4199b9e999744f74c85f6163705c4813cd4629bfea249f23bee60eab59039128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F4 11052 bytes
font_02_sfnt_off00012db8.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB8 4324 bytes

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