Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3a3df7199bf4b5…

MALICIOUS

PDF

73.6 KB Created: 2021-04-03 02:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4849e0ed54ed9d3742c3ce65e9cc3d2 SHA-1: 33ae600667a1a02e8434d09f87d2417c8124fc53 SHA-256: ea3a3df7199bf4b52bbc2550fa4ce3927c12430cf7a9a789de8f00fbcff8f358
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, suggesting it is designed to host numerous external links. One such link, 'https://kuzutuzo.ru/award?keyword=madhyamik+physical+science+book+pdf+free+download', is presented as a download for a physical science book, which is a common lure for phishing or malware distribution. The ClamAV detection and ML classifier also indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8697

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://kuzutuzo.ru/award?keyword=madhyamik+physical+science+book+pdf+free+download
    • https://cdn.sqhk.co/xevowuto/ij1zgfM/zogonizirufuzezobowi.pdf
    • https://cdn-cms.f-static.net/uploads/4367279/normal_600e5f10f31d1.pdf
    • https://cdn-cms.f-static.net/uploads/4417329/normal_6018f28cca0ad.pdf
    • https://static.s123-cdn-static.com/uploads/4367275/normal_5fee8936ce14b.pdf
    • https://cdn.sqhk.co/xeloxilava/uZdVRjb/58485355573.pdf
    • https://cdn.sqhk.co/tinulafi/hfggGje/tusefipuwipupeluta.pdf
    • https://cdn.sqhk.co/tedubifo/jijbcPe/dabafugotinedakivate.pdf
    • https://cdn.sqhk.co/rudixika/gkji9gx/75056947831.pdf
    • https://static.s123-cdn-static.com/uploads/4501484/normal_60095d76cad55.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68df8376-f70e-4e14-9f19-e0d261701f92/what_is_a_fine_dining_menu.pdf
    • https://s3.amazonaws.com/donake/constitution_bill_of_rights.pdf
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_95eaa9f7886544c0856991f1f056cf69.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7a2e69ba-b443-4339-9159-6eaed93915d7/99962282177.pdf
    • https://uploads.strikinglycdn.com/files/a7f93c8b-395d-48e5-9959-34303ea41d9c/1305734961.pdf
    • https://bc881323-2374-4635-a2b7-f126f9929bd8.filesusr.com/ugd/546a35_1b625f013bd34b70b45fa2537202ddef.pdf?index=true
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_12840994f60849acb8926bb73c06ed3d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23cfdaa5-b764-49c4-bc1e-d22f5e8112c5/zoxakumenuxamexobotep.pdf
    • https://uploads.strikinglycdn.com/files/8f78fef9-f4bb-46b8-b218-e7247d94315c/xipepitogibi.pdf
    • https://uploads.strikinglycdn.com/files/1a087cab-5fc6-4f1e-b7e5-9f8679e6e208/how_do_you_clean_a_masterbuilt_electric_smoker.pdf
    • https://uploads.strikinglycdn.com/files/e256553b-d893-404c-916b-927ba74b926f/samsung_smart_care_vrt_plus_washer_error_codes.pdf
    • https://s3.amazonaws.com/jivagajamav/acting_terminology_crossword_puzzle_clues_answers.pdf
    • https://uploads.strikinglycdn.com/files/a3e6dfb7-736f-45c5-bdd1-1fd2ab6121c4/99686894283.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001103f.bin
1b12b30b79b547cbb5e0f05ffeeb94ad25938db988396416d9ab9fe496b3f5a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1103F 5504 bytes