Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8eb57cd4ab6ab9e…

MALICIOUS

PDF

80.5 KB Created: 2021-02-13 16:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 51bfa1bf880d1fbc466243d683521b60 SHA-1: 872c38aedfc47d8c4e1a9d079ac7d7f373224b64 SHA-256: b8eb57cd4ab6ab9e1bd4eac3db2f988a83fe00ca288bdd7c70bfe2061f7c6bc1
96 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with a significant number pointing to PDF files hosted on various domains, indicative of a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs suggests an attempt to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point towards a malicious document designed to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://druttle.ru/wix?keyword=perfect+competition+economics+worksheet PDF link annotation
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/6975ea46d.pdfIn PDF document text
    • http://fivabigenarewo.22web.org/33329720765.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/ab5671c6b8.pdfIn PDF document text
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/f27d3ff5f.pdfIn PDF document text
    • https://jijobowuzum.weebly.com/uploads/1/3/4/5/134590228/ae2201.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/7b1cefb8c9cc40.pdfIn PDF document text
    • http://junelizirigoroj.iblogger.org/39488009828.pdfIn PDF document text
    • https://mexepefavofuj.weebly.com/uploads/1/3/4/6/134659137/gadeni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusewijoje.epizy.com/julomifivazutu.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/define_unemployment_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/betpawa_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/pigasokogupagixamuluzuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/colt_m4a1_carbine_airsoft_manual.pdfIn PDF document text
    • http://fukokikedusej.epizy.com/worunomalapigodozobodufab.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/wow_cataclysm_mouse_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/sabegokek/hd_screen_wallpaper_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/bose_soundsport_free_wireless_guide.pdfIn PDF document text
    • http://rujemivegelap.epizy.com/pivore.pdfIn PDF document text
    • http://fobapisarut.epizy.com/compass_directions_and_angles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/aruba_controller_7005_manual.pdfIn PDF document text
    • http://vifowas.epizy.com/wepusoz.pdfIn PDF document text
    • http://mepigaruvuj.rf.gd/roxaxeza.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_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 5168 bytes
SHA-256: 91322d93f566e89d5a30be7fa5bc41a9610006d2428d80ecce386b2d2ddc6325
font_01_sfnt_off000110f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F5 10316 bytes
SHA-256: 5307dba0722fc16ee6c8b18630747ab4d0978bdbc16060dee65d47e172ea0bbf

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