Malicious PDF — malware analysis report

Static analysis result for SHA-256 795835d573ade2ac…

MALICIOUS

PDF

350.9 KB Created: 2021-03-29 09:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a71dac8369a9a1cfd656b31b4441af6a SHA-1: 2bee1b9eb4bc2674af94fe85733c8c8c541ddbcc SHA-256: 795835d573ade2acd08f33a844d186c2f59a07d60c947b975a635ae8d061f760
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the primary one being 'https://maypoin.ru/strik?utm_term=college+esl+placement+test+practice', which is presented as a college placement test practice resource. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of multiple suspicious URLs and the PDF's structure suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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://maypoin.ru/strik?utm_term=college+esl+placement+test+practice PDF link annotation
    • http://wisumezuj.22web.org/excel_footer_to_all_sheets.pdfIn PDF document text
    • http://eagleaff.com/tovanakiwinawokumemisek0shq.pdfIn PDF document text
    • http://zadidibupinumav.22web.org/73173820487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448556/normal_5ff01b9791a3e.pdfIn PDF document text
    • http://patajafurep.mywebcommunity.org/what_is_my_zodiac_sign_according_to_vedic_astrology.pdfIn PDF document text
    • http://pop-marketplace.ru/how_to_change_time_on_bose_wave_music_systeme5nqj.pdfIn PDF document text
    • http://jinevul.mygamesonline.org/causality_models_reasoning_and_inference_2nd_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/fReWghd/bomber_friends_apk_old_version.pdfIn PDF document text
    • http://lastmarkt.ru/67974878372m45lw.pdfIn PDF document text
    • http://hot-money.fun/xonusu5ep85.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/gkVggUU/nezilabikoluku.pdfIn PDF document text
    • http://fuwiduwoxobol.mygamesonline.org/abraham_maslow_hierarchy_of_needs_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501356/normal_5fc7c8a73b5b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_600db0ae3ac26.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/rafiralexezol/49177233707.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/what_was_life_like_in_the_1930s_in_australia.pdfIn PDF document text
    • http://mobavegot.rf.gd/dimakifukuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/13966445102.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/android_recyclerview_example_source_code.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_off00053429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53429 5156 bytes
SHA-256: 9d40670ae48f1724a96d183e40d560c45dce4136fe66a8e0352060aad104ce54
font_01_sfnt_off000545a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x545A3 11096 bytes
SHA-256: e481ba4b785462a3341bc298b7cfddd2efd7b4bdc0c428e1379819d57653fc4f

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