Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a63a5e0d02f006…

MALICIOUS

PDF

87.2 KB Created: 2021-05-01 16:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f337aa79cb02c996cdff010e3fcf369d SHA-1: 25ef8aa8a772b09c0b4341ed1c8f82b5957e929c SHA-256: 28a63a5e0d02f0063cdf916eb539d4b6cbb0f4854092c75ef0ceebc8d14c9ef6
96 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded URL pointing to a suspicious domain, which is likely part of a phishing or credential harvesting scheme. The presence of PDF-specific heuristics further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=what+are+the+weirdest+phobias+in+the+world PDF link annotation
    • http://septiki-rf.website/95415013608z72x9.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/3Ijicjd/skin_for_roblox_download_apk_uptodown.pdfIn PDF document text
    • http://agentsoft.space/comic_page_templateso5qnr.pdfIn PDF document text
    • http://gikilebi.iblogger.org/53365014161.pdfIn PDF document text
    • http://cashbackmoney.info/rexugokofeznu8c9.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/JohhjcI/makinopow.pdfIn PDF document text
    • https://vadiduriku.weebly.com/uploads/1/3/4/4/134445950/tazab.pdfIn PDF document text
    • http://kinorio5.xyz/zevezubiweramieyica.pdfIn PDF document text
    • https://guditeni.weebly.com/uploads/1/3/4/5/134529862/339522a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dinedolorexos.rf.gd/adecco_salary_guide_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wolawatin/reporter_amharic_ethiopian_news.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/kindly_find_below_information.pdfIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_f1b95b149a3c4f0cac16dbc1434b0154.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupoti/madewolekovojonojanekim.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_3f4db81b844e445796ecfd980dea3107.pdf?index=trueIn PDF document text
    • http://fuxurekosorozu.rf.gd/how_to_make_a_cape_out_of_a_bed_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/65169382254.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_off000114b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B1 5292 bytes
SHA-256: 1e7cfcdd395a781f716211039ba88a82aec876d4985353dd6dee97b62ad765c3
font_01_sfnt_off000126ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BA 11768 bytes
SHA-256: 8ea58ccc76552b875312b9c727472ebbf3b617d5ffba6d96e1abbb35687bf68b

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