Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77b3d1e9b0ee1bb…

MALICIOUS

PDF

74.9 KB Created: 2021-02-21 17:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 44a22b4cf3a08fb8fa3ecddf4c2e247d SHA-1: 8c8bfb063d03d660c74efe42785b0816957f5e4d SHA-256: a77b3d1e9b0ee1bb93621011269f86090db5b691cb7d66a86942f261be09a61d
194 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 designed to lead users to download cracked software. The document body, though heavily corrupted, contains text fragments related to software cracking. The presence of a malicious redirector and the nature of the lure suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://yafferge.ru/strik?utm_term=cubase+elements+8+crack+free+download+serial+key In PDF document text
    • http://barberking.best/68800666710lew57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_60009e428d5eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601c7b182662d.pdfIn PDF document text
    • http://tonagruz.ru/motorola_verve_buds_100s5p2y.pdfIn PDF document text
    • http://adyga.site/gemezebodpdp9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459177/normal_60252d89b0846.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412774/normal_6009ee1cdf9ae.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/xotomisen/nedape.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/doctor_sleep_directors_cut_differences.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/43539648479.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/66996900488.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/subpoena_duces_tecum_template_florida.pdfIn PDF document text
    • http://pesewaluzitapu.epizy.com/buvalikatelu.pdfIn PDF document text
    • http://bimemulu.rf.gd/besame_mucho_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/83558051325.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/reverse_phone_number_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fotepopunaj/bivirurefe.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_off0000e383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE383 5664 bytes
SHA-256: 1c913b98c9d8f37044654c556dec3742e8d31d91e9abe4c8c2ef71916463a8d1
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 12024 bytes
SHA-256: 46557d3dcaa424a2d343875c94126973d8bc2fd973f13af20d08cdf3361e62e4

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