Malicious PDF — malware analysis report

Static analysis result for SHA-256 c768581156425998…

MALICIOUS

PDF

77.1 KB Created: 2021-03-14 16:27:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90cd14fe81e788276db28506fb66398a SHA-1: 75a036fde751c40a7924dc81bac40c9404d433db SHA-256: c76858115642599827de9a222cd3efd4771b6c30586933fb390fb0a94b14ec14
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent URL pointing to a domain associated with phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, a common tactic for phishing or malware delivery via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=kindergarten+addition+and+subtraction+worksheets+pdf
    • http://i-men.ru/fironotovuwaxoukfqi.pdf
    • http://dalnoboyi.xyz/adding_machine_playvxs39.pdf
    • http://makebugobiwuka.mypressonline.com/how_to_use_krups_espresso_machine_xp3208.pdf
    • http://kinorio5.xyz/kumudam_reporter_ebook0sinn.pdf
    • http://idclick.cash/ramojajegapoxa6zfd8.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_9e41a87180014c79b289f2b77e49f76f.pdf?index=true
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_1fa6f7b3c9c94c2bb3cd665a7882f7f4.pdf?index=true
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_810f34d0bc1a480eb2167ca5a8096af9.pdf?index=true
    • https://e3055f73-6236-423b-b810-4bc1a15f300f.filesusr.com/ugd/fa12d1_ccb6d0f06dd649d7b513ebf26c222676.pdf?index=true
    • http://jomopizemiz.onlinewebshop.net/62316161541.pdf
    • https://uploads.strikinglycdn.com/files/c9c0e3cc-16fa-43de-8b95-c992f6d39740/how_much_would_it_cost_to_build_an_indoor_sports_facility.pdf
    • https://uploads.strikinglycdn.com/files/bab83676-bf33-4a68-afef-59077eea9c8b/debolojorezo.pdf
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_e85f8011df814477b179a228ae602bd0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/ef6e1569-87a6-4d6c-a2f9-90498679db84/83758290412.pdf
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_117d1c333b0c4dc49862a50ced717578.pdf?index=true
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_0b62335855a74371ad9a4e0d1c913bc6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f7aef9fa-7f07-40bd-829b-e0eac7b56d00/plantronics_cs351n_pairing.pdf
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_c09704b838c54f7594bf86943f88be17.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2e3ddf4e-765d-4821-a399-7bbd1b5011f2/data_analysis_methods_in_research_proposal.pdf
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_ab99099d6b844e88be93e5d8c7a191f4.pdf?index=true
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_13cc232272bf458fa1b21f3c7069dbdc.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf5.bin
1bb083f3fe3fcdc347d772bb8c1f10a57e4a167b05765e7339e3c4bbdd1bf15e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 5652 bytes
font_01_sfnt_off0001013b.bin
21020b0f15fbfd997109c53d468c0e435374eb100e3db7d19ae7ae5481c14c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 10340 bytes

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