Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d4527b3d2b82c7a…

MALICIOUS

PDF

92.8 KB Created: 2021-04-29 13:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 22e1e3ee36af6d14752ad4219f454af4 SHA-1: 74fe104b667e35e52d91a0e9be8eb8116485993e SHA-256: 5d4527b3d2b82c7a175545d21ac65878be0a310bd896c338fc3cbfbfb7f6634c
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, suggests a lure related to 'math olympiad problems pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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://midufefew.ru/strik?utm_term=math+olympiad+problems+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494165/normal_5fe7d69b16251.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CqLhfN7/localizar_mi_android_por_gps.pdfIn PDF document text
    • http://wotedogupowu.sportsontheweb.net/bsc_nursing_entrance_exam_question_papers_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413225/normal_601b52e5213a1.pdfIn PDF document text
    • http://bewilotaweje.mywebcommunity.org/al_anon_12_steps_and_12_traditions_book.pdfIn PDF document text
    • http://zokupez.mygamesonline.org/6946754531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_605d7a3c00b91.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_606d048379644.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/dgeWXgi/52069352386.pdfIn PDF document text
    • http://pokypka.xyz/what_does_the_expression_raise_the_roof_meansuxw67.pdfIn PDF document text
    • https://cdn.sqhk.co/bixevemaxi/8TJtsgg/dewalt_router_template_guide_set.pdfIn PDF document text
    • http://baltika-trans.com/that_s_life_sinatra_meaningwegu4.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/26098012211ssz8s.pdfIn PDF document text
    • http://lynciguest.com/13643614555rsuba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/medipovebarejana.pdfIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/melexivetupujelatef.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/bulewolodajenigubirubof.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/20583327668.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/flowking_stone_fire_bon_dem_remix.pdfIn PDF document text
    • http://ruzofugeru.myartsonline.com/javascript_validation_tutorial_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/calculate_affine_transformation_matrix_from_points.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/fo4_mod_guide_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/what_is_the_importance_of_textbook.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_off000127d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 5528 bytes
SHA-256: 341fecb24c8e2811191d5e1181e35425e26705e0fe52830c713dff1ec343bc5b
font_01_sfnt_off00013a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A81 14436 bytes
SHA-256: 02b49fa49cc41abe8daa7ed2b342ad8894fb34a7fca1dde6dee825c93abc4239

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