Malicious PDF — malware analysis report

Static analysis result for SHA-256 73bebe5eb8ebc253…

MALICIOUS

PDF

63.0 KB Created: 2021-02-15 15:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ab782a4dbf9d9de7d143d82c998c4959 SHA-1: 63fd18c73d1ee9890a570a532c2ba7a2a0f2f810 SHA-256: 73bebe5eb8ebc2531bd525b8af828431f9b990abaad4e8746e2ecad07a7bae7d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wb?keyword=rca%20voyager%20pro%207%20specs'. This indicates the document's primary purpose is to trick users into visiting a potentially harmful website. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of malicious links suggests a phishing or credential harvesting attempt.

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://yafferge.ru/wb?keyword=rca%20voyager%20pro%207%20specs In PDF document text
    • http://small-italy.space/recommendation_letter_for_dialysis_nursessl3fg.pdfIn PDF document text
    • http://redtea.space/50326307404qppta.pdfIn PDF document text
    • http://wellwork.site/3d_printed_mazezer2r.pdfIn PDF document text
    • http://flymoney.net/fixed_bottom_navigation_bar_android819z6.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/jeponowon/best_online_watermark_remover.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/beginner_crossfit_program.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/levop.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/broken_angel_english_version_song.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/74654301712.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/bottom_sheet_dialog_android_library.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/ruwaxunofedufawavetu.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/us_nutrition_facts_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/h_c_tv_guide.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_off0000b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 5316 bytes
SHA-256: 23f7165f81e100f61a079bf0987f6c913a0952ed03bc3f1e41c9d18ed4d623f0
font_01_sfnt_off0000cb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6C 10732 bytes
SHA-256: c54b4ae2c834ad64fe95fb277282880ce0999cfdcbf051c01581a593a2f6019c

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