Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ffd7de97fc6a96…

MALICIOUS

PDF

92.4 KB Created: 2021-03-25 13:33:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: beea0dab877c6b0fdb6980e23196df95 SHA-1: b30fa282461a10f8a8dcfe12fe73daec61d4b0a0 SHA-256: f4ffd7de97fc6a966eb6532be99a751ac7732ecaeee1ef708d55bfdf02b74dc0
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The embedded URL, https://vilenefex.ru/strik, is likely the primary payload delivery mechanism, disguised as a search result. No scripts were extracted, but the PDF structure and embedded URI heuristic suggest an attempt to redirect the user to this malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • 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
  • 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://vilenefex.ru/strik?utm_term=what+color+is+prestone+power+steering+fluid
    • http://center-about.com/jomidixzjo88.pdf
    • http://gebuhrenfrei-mein.com/dungeons_and_dragons_5th_edition_warlock_guide24yso.pdf
    • http://cabinetsly.xyz/what_is_the_difference_between_apple_magic_mouse_1_and_2ro5jo.pdf
    • http://padapup.iblogger.org/how_long_does_it_take_to_get_gre_subject_test_scores.pdf
    • http://meetchambre.xyz/craftsman_leaf_vacuum_shredder_bagger_bloweragq4l.pdf
    • http://wavasesinile.22web.org/word_puzzle_games_for_android_phones.pdf
    • http://karma-911.com/newexepilofiwumkpmlx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://terezeso.epizy.com/55832765445.pdf
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_1885f6eaec0e43d489b26c9dcf8f4b1d.pdf?index=true
    • http://pozenejuz.rf.gd/how_to_calculate_manufacturing_cycle_efficiency.pdf
    • http://zorijofoxafa.epizy.com/prentice_hall_physical_science_textbook_answers.pdf
    • http://zunebitalubale.rf.gd/balanopostite_infantil.pdf
    • http://vifidunut.epizy.com/diary_of_a_wimpy_kid_book_number_16.pdf
    • http://temewafin.rf.gd/algebra_ebook.pdf
    • http://kelajerifa.epizy.com/intermediate_microeconomics_varian_solutions.pdf
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_e85cfab6769145068656a14a42eaec38.pdf?index=true
    • https://0b21792c-a699-4cf4-8833-5910c6ad58af.filesusr.com/ugd/b0b521_e6bb79a0f9aa466cb3d65e5744c0b6f8.pdf?index=true
    • http://fenubamijub.epizy.com/best_spreadsheet_for_macbook_pro.pdf
    • https://uploads.strikinglycdn.com/files/252242a7-3256-4550-a9a0-67db34c2d702/python_logical_operators_if_statement.pdf
    • https://uploads.strikinglycdn.com/files/c8e2390c-8123-4ae6-9737-e3c9b169d63e/22803941064.pdf
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_88fd3b7dd57145b6bf86a1f7c58b00ca.pdf?index=true
    • http://nozefemalevarug.rf.gd/18154368389.pdf
    • http://wozurowimure.epizy.com/fesatosavepokofoja.pdf
    • https://uploads.strikinglycdn.com/files/805d7444-0f7c-4810-8f08-df7622a2dce3/degree_to_be_an_operations_research_analyst.pdf
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_5d04c761be8d46e48c7827c11c1d3527.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d05.bin
baa8e413d2e29501a0b538a8930a65223f1d05103a11a272e95512eca78f3f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 5404 bytes
font_01_sfnt_off00012f75.bin
334b3be91a78a6e9dcefc7ea959ff81fe186dbf43a62a4ab7f8fef0c27d1a813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 11260 bytes
font_02_sfnt_off00015585.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15585 4324 bytes

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