Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba83c4f396ba6f54…

MALICIOUS

PDF

78.9 KB Created: 2021-02-16 01:05:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: d21fdd1f16549cad63379d644676984b SHA-1: 7bfb6ec3c3e38a723f560ee3830cbd07ba41002b SHA-256: ba83c4f396ba6f54421c0d271b6fecb2a2904a3d04d6ca8c5758a984070c1f5b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF SEO link farm, with one prominent URL being https://druttle.ru/strik?utm_term=the+power+of+prayer+verses. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malicious redirection. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/strik?utm_term=the+power+of+prayer+verses PDF link annotation
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/zinap.pdfIn PDF document text
    • https://pepajodik.weebly.com/uploads/1/3/1/4/131453945/295c8eb248f7.pdfIn PDF document text
    • https://tulaliferejuza.weebly.com/uploads/1/3/0/7/130775137/69c035c440.pdfIn PDF document text
    • https://raduwefun.weebly.com/uploads/1/3/1/1/131164260/da5f270bb008.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://budezeja.rf.gd/acc_aha_guidelines_antiplatelet_therapy.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/aether_2_mod_1._7._10.pdfIn PDF document text
    • http://moroxite.epizy.com/pukelovinedaki.pdfIn PDF document text
    • http://dolasuwukino.epizy.com/kigenupokiwidevekago.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/template_kaos_polos_hitam_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/the_wave_movie_2020_trailer.pdfIn PDF document text
    • http://manomujutob.epizy.com/business_research_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/winter_white_dwarf_hamster_care_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/kegilamonasikelapojuju.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/video_er_for_iphone_6.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_off0000f866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF866 5160 bytes
SHA-256: 5785d55b5a255a1f79059342b2fb19cda79fe23d7771b5e9ca9afcf5aba01a6b
font_01_sfnt_off00010a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A08 10824 bytes
SHA-256: 24d053ce0254e07dd53b05698a72c6783899d305f1f9fea8e84f5bc23e2b5118

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