Malicious PDF — malware analysis report

Static analysis result for SHA-256 418379c05502b05c…

MALICIOUS

PDF

84.6 KB Created: 2021-05-19 23:15:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10c94a8722bd3dc0321f94c2ee116bae SHA-1: 971fecf283db66e6afea6e85575b2941281552b2 SHA-256: 418379c05502b05c1c080fe29a2248cc165da74ac13b53f7a8edc0f4d7e86628
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a phishing site, disguised with a seemingly legitimate topic related to GST registration. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish for credentials or deliver a secondary payload. No scripts were extracted, but the presence of a malicious URL within the document body is a primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://ponafet.ru/strik?utm_term=how+to+activate+cancelled+gst+registration
    • https://cdn-cms.f-static.net/uploads/4390074/normal_5fe9fc3193606.pdf
    • https://cdn-cms.f-static.net/uploads/4496810/normal_6047834353d5b.pdf
    • https://cdn-cms.f-static.net/uploads/4365576/normal_603efbaa23eb5.pdf
    • https://static.s123-cdn-static.com/uploads/4366949/normal_5fe49e055ca9b.pdf
    • https://cdn-cms.f-static.net/uploads/4490377/normal_60340b28c6ed8.pdf
    • https://cdn-cms.f-static.net/uploads/4460966/normal_602879a47c571.pdf
    • https://static.s123-cdn-static.com/uploads/4476938/normal_5fe5e99ea2618.pdf
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5fe5f361c0f96.pdf
    • https://cdn-cms.f-static.net/uploads/4384050/normal_60161680df21b.pdf
    • https://cdn-cms.f-static.net/uploads/4501360/normal_60549264d492b.pdf
    • https://cdn-cms.f-static.net/uploads/4369324/normal_6032682a7d8f3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/967836cd-49d9-47a1-ba4b-4366b841a430/chapter_4_atomic_structure_wordwise_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/5019fa56-59cb-454e-85a6-7c9fe4051315/faxeninalovopuvikelamuv.pdf
    • https://uploads.strikinglycdn.com/files/3d83c5b8-fe6f-4f55-a441-b2a9e4790c0c/is_it_important_to_know_your_roots_as_a_person.pdf
    • https://s3.amazonaws.com/nerugiraxura/laser_boresight_targets.pdf
    • https://s3.amazonaws.com/xezujuxoz/juluxixusuti.pdf
    • https://uploads.strikinglycdn.com/files/a4c10758-1cf5-4d6c-86ce-88b80be9b17a/how_to_login_to_facebook_portal.pdf
    • https://uploads.strikinglycdn.com/files/0183aeba-2054-4c74-98f8-e3436a5f02b9/kefedimufotok.pdf
    • https://s3.amazonaws.com/rebomedug/chassis_number_format_india.pdf
    • https://uploads.strikinglycdn.com/files/5a1e625b-7c18-453b-a24d-ab6d977815c8/garmin_vivofit_4.pdf
    • https://s3.amazonaws.com/wovugi/dirt_devil_scorpion_plus_corded_handheld_vacuum_cleaner_sd30025b.pdf
    • https://uploads.strikinglycdn.com/files/65bdf486-7bb1-4226-903b-25c507c3dd4e/why_wont_my_karcher_pressure_washer_work.pdf
    • https://s3.amazonaws.com/kifutizijebuj/8585417601.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fef6.bin
27a5711e81188ce2b1cbcc033d900a4f5ae3f247271594bf66df6b98854278ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF6 5008 bytes
font_01_sfnt_off00011017.bin
13f3822d0e931d27ad23d9178a3ff11ee0ed002faf167c3602d06fed8a82c219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 11264 bytes
font_02_sfnt_off000136a4.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 4324 bytes

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