Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bae16ae6a4f37d…

MALICIOUS

PDF

94.7 KB Created: 2021-02-08 04:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 6c6119705b226150f1aefa36603465e4 SHA-1: 478135bd7aa7afccca5b9a1525acf44331a1160e SHA-256: 66bae16ae6a4f37d5ee20094016bc7930fe47e1987e9b26c2c3cf84e0ff5383c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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/aws?utm_term=auth.+log+date+format In PDF document text
    • http://help-copyrightviolationhelpcenter.com/structure_of_dna_rnapq2dc.pdfIn PDF document text
    • https://zikegebuner.weebly.com/uploads/1/3/4/8/134856814/69ef962.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372086/normal_6003b855ec452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424013/normal_5ff28b27beed3.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/0963e2b51f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417037/normal_5fcf93d2d9200.pdfIn PDF document text
    • http://doorstepcomputers.com/wuwafuvupusidirodafinge8d.pdfIn PDF document text
    • https://bozobamawokoruv.weebly.com/uploads/1/3/4/3/134350924/f3419ee.pdfIn PDF document text
    • https://zibozofos.weebly.com/uploads/1/3/4/8/134896422/lusuzepukir_lozujexunipu_piwekuloxisomid.pdfIn PDF document text
    • https://tejojixamabaje.weebly.com/uploads/1/3/2/7/132740549/fusak-sokiji-xezoz.pdfIn PDF document text
    • http://slmit.fun/gemstone_identification_book7to4j.pdfIn PDF document text
    • https://wubajepetodol.weebly.com/uploads/1/3/1/6/131606368/gefolimelem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488339/normal_5feb922fcdd7d.pdfIn PDF document text
    • https://suwekamepegatir.weebly.com/uploads/1/3/2/6/132682685/4147848.pdfIn PDF document text
    • https://fomemavinujidi.weebly.com/uploads/1/3/1/4/131414297/koripunivuli_widasawef_jokire.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/lunuki-miwuwote-dekat.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/jolunenafobuw/xuzofegifoxidineko.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/xawabuziridixaduranuj.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D79 5164 bytes
SHA-256: ea0ec9f0956f62d01272850cef5bdd911f5daafd787f7249e2e6bc819acfca6d
font_01_sfnt_off00012ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE9 11900 bytes
SHA-256: 39dcf320d2bb1caab4a4049a854d353338f8fe16e4e83724e55be116318a498e
font_02_sfnt_off000157b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B9 16244 bytes
SHA-256: d1c727812a8f964882f1301a824b6764c0f15d18538cb9e0ca36d9eb6e966c11

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