Malicious PDF — malware analysis report

Static analysis result for SHA-256 121909bf031c6ec4…

MALICIOUS

PDF

79.3 KB Created: 2021-05-28 19:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: b608efe2d1cb86c2d5864c5b0d4b4da2 SHA-1: 98b07554b41eda3054cc5b76babb311891ad7284 SHA-256: 121909bf031c6ec4dc1b310089bdbcadf3a49002549961cd042ea16a4cb43a1d
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and ClamAV detection. The document body, though heavily obfuscated, suggests a lure related to obtaining in-game currency, likely to entice users to click the malicious link. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=how+to+get+money+fast+in+gta+online+solo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_6050b910c6107.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_6008b43bbe870.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_603fa048023a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490274/normal_5ff2ac1099ae6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f36f3d98-0133-46a8-b1d4-abde1ad5241a/paragraph_structure_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2418e0c9-7c83-4347-bddc-02a642f74476/how_to_get_script_on_roblox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c484caf-c42b-446e-9b62-2a91b839b49d/chapter_test_a_chemistry_in_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e61fe37d-7f0b-4500-9d7b-877be45d3bd3/dezofoligisij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c8e0e5-1989-4848-9815-47892126dc99/100_to_1000_numbers_in_words_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc0110d-4c58-450b-b1db-fc4428dda065/koferidawerideduf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b406fe64-29df-4d02-b34f-0531ca82b330/net_interview_questions_and_answers_for_3_years_experience.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c975a62-e275-4d13-9e2f-d7db4d120133/how_do_i_fix_the_red_light_on_my_tp_link_router.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b60dbc05-34c2-4c92-a5d9-f6100a46fb72/bekinozijilusu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10eb6895-9f22-44b1-8dbc-6ecf1b563b89/raf_aircraft_technician_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0a47a9-2167-4a5a-b3a7-cb68a555b24b/zonadorewinizufawamubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd142e19-2ed9-4e9d-b49d-cc4171e7d121/schaum_series_vector_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2a68a61-3e6f-4836-a2a7-1712b2410ee9/kidde_nighthawk_combo_smoke_co_alarm_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea6ba78-647e-4097-8891-861b0360065f/60515419895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a33d5b-84ec-43ee-9f2f-f3a5ad057dea/15540971076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82756ed7-79fa-4489-8cf5-9667da9ddec7/hoover_max_extract_all-terrain_carpet_washer.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_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 5148 bytes
SHA-256: cac4e517fcfb0b5b10119a64d4cf78370e1045068a05d46cd53c8980a9a89178
font_01_sfnt_off000109d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D2 10680 bytes
SHA-256: c14098a68a3a64f7c15ea0563c959e3f466b15fe50a4a35b221345a01af26206

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