Malicious PDF — malware analysis report

Static analysis result for SHA-256 8efae7ee04b96e0a…

MALICIOUS

PDF

99.9 KB Created: 2021-02-17 05:47:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bb533c1b969e1c3bbd4aa33f10f2552e SHA-1: e1e8f1f3b525e1bab3fe1c0767b37d24ec598eb1 SHA-256: 8efae7ee04b96e0ac5c2d94773e3cf3eb3a7bbe456395998ca3eb3644e3fe45e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded external links, a technique often used for SEO farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/123?utm_term=ozeri+kitchen+scale PDF link annotation
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/notipugat_zijegoso_fukiwubar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455390/normal_60093111e60ea.pdfIn PDF document text
    • https://cdn.sqhk.co/vekepafate/CYjis7G/remefuwikefipuvobosoxow.pdfIn PDF document text
    • https://cdn.sqhk.co/nadovexum/VzGiihe/sebugutiwaxuwivor.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/hcDgchi/shadow_fight_2_hack_ios_no_human_verification.pdfIn PDF document text
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/3827cd4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374979/normal_6002ea74f20f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_5ff581f434c2c.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/zuxime/ryobi_6_bench_grinder_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/diaphragmatic_breathing_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/94812487067.pdfIn PDF document text
    • https://s3.amazonaws.com/sisaxu/fiddle_faddle_leroy_anderson_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/60089681448.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/22170388902.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_off00014c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7F 5028 bytes
SHA-256: 43e831e205ce53ce5bb87885798c9f50eb734472247bee94aebe249a704fef82
font_01_sfnt_off00015d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D99 11188 bytes
SHA-256: dc36f1b8ee8ba42a272810da9158d475bdd9b0fe057d323fba588e91c7875050

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