Malicious PDF — malware analysis report

Static analysis result for SHA-256 a915336fdc6b96a7…

MALICIOUS

PDF

81.6 KB Created: 2021-04-07 17:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 134d57ee67fb902408c9ede20845e31c SHA-1: f2d2b907a73f712f31fff817a7435df1132c814f SHA-256: a915336fdc6b96a72ede7715056436ea92414080574e421ca5090302236816d2
96 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to 'vilenefex.ru', which is flagged as a high-risk indicator. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains text fragments that may relate to user access, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://vilenefex.ru/strik?utm_term=my+cloud+user+access PDF link annotation
    • http://bagerisevi.scienceontheweb.net/gotuderawase.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/fjePw7v/dental_assistant_and_hygienist.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454543/normal_5fc6b85b656d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503874/normal_605aeb408093b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_6054c16891c21.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/gcicWic/vuforiza.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/LhiWAji/kali_linux_android_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386824/normal_5ff2c740b241d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393883/normal_603503636b54e.pdfIn PDF document text
    • http://wugipesirexoxof.mygamesonline.org/92383620420.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/QJV11ii/attendance_sheet_template_for_training.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_602d005f0adb1.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/ncleo_caudado.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/bupijila/56882364585.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/nizozadopatadifogewireni.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/fabikajupalofor.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/zetipek.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/wuwedipazapune.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/nomezigirej.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/canoscan_lide_120_free_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/koreged.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/emergency_reporting_tech_support.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/jumbled_sentences_exercise_with_answers.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_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 5040 bytes
SHA-256: 2e4dc25733cb99404e3a52cc4a435c812407edff1047d9bd9ab781b08834f6a7
font_01_sfnt_off00011370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11370 11396 bytes
SHA-256: 6a1390841f37eff222cd295434d24c60567de0b7f7e3008a8023801b0eb96724

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