Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb716811e2e5158f…

MALICIOUS

PDF

76.2 KB Created: 2021-02-14 10:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7dd2c2e341c7de75cb61729f5bebeeab SHA-1: c2a83b48aa89a3aef82d6279b04c821677ee5e7a SHA-256: fb716811e2e5158faf66bc5bb28960480055f530993a51f288618f168426ff67
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is a strong indicator of phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to job interview examples, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/wb?keyword=weakness%20job%20interview%20example%20answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387219/normal_5fda8cebe2fee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371800/normal_5ff0206670450.pdfIn PDF document text
    • http://healsmall.space/lajefoliwopoberokazi4c245.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446937/normal_5ffb12907d76b.pdfIn PDF document text
    • http://razixir.22web.org/6342258919.pdfIn PDF document text
    • http://vuxiparami.22web.org/audacity_windows_10_free.pdfIn PDF document text
    • http://wazasutosas.iblogger.org/bariyan_ashiq_mizaj_akhan_audio.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/robumuduluwise/desierto_florido_informacion.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/azure_cloud_services_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/xubepiwuvezis.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/swiftkey_bitmoji_android.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/fractured_but_whole_character_sheet_titles.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/fsbpt_individual_score_report.pdfIn PDF document text
    • http://kojodidekojamu.rf.gd/barometro_de_las_americas_2017.pdfIn PDF document text
    • http://putagasixebe.epizy.com/good_answer_to_job_interview_questions.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_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 5480 bytes
SHA-256: e63d23f534b164f769f985fc13a5065710eecda20003f1198c1e1b8fee43776a
font_01_sfnt_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 10648 bytes
SHA-256: 129d77a43efcf26fa55c050f713d0837a2ba97260abd0e80c18e58c9551e4328

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