Malicious PDF — malware analysis report

Static analysis result for SHA-256 435f8ea6b7a24b87…

MALICIOUS

PDF

75.5 KB Created: 2021-05-27 08:05:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: eec506c02a6a849b804f0205277e358f SHA-1: cca0b63a7075a1b68f7d504dcfd83ebd0c3e43b2 SHA-256: 435f8ea6b7a24b87c3ba43f7e5b32829748d198a348ce4cdd36c823799df7c2c
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing or malware distribution lure. The presence of a fake CAPTCHA prompt (SE_FAKE_CAPTCHA) strongly suggests an attempt to trick the user into interacting with the document, likely to trigger a download or exploit. The embedded URL to 'midufefew.ru' is a primary indicator of malicious intent, potentially serving as a download source for a second-stage payload. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=battlefield+1+activation+key+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405902/normal_601dc79263870.pdfIn PDF document text
    • https://tazeviguso.weebly.com/uploads/1/3/4/3/134339516/8202658.pdfIn PDF document text
    • https://wuwinotidewav.weebly.com/uploads/1/3/5/3/135349353/8a86c9a504a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392668/normal_603ee8bd4ae72.pdfIn PDF document text
    • https://pisolani.weebly.com/uploads/1/3/4/6/134668870/taxuka.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/47a99ffd-d4cf-48c2-9c8f-1ef758c7bc82/16057585013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb5ac878-8f85-4804-a221-761a0e6c2b39/400_essential_words_for_toefl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034041ce-e07e-4c01-8411-55b7652a88a9/bibuparofewusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932f6edd-9096-4576-8ab0-23bb8389b4be/wekugasesewiweme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f78a228-6782-4f85-9073-c27114d6f740/how_long_does_a_ryobi_40_volt_battery_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c1cf69-7aa3-4a59-8d68-b769c6665747/grade_10_english_module_teachers_guide_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc49506-981d-4996-bc86-f09409406ed0/whirlpool_dishwasher_wdt720padm1_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06d15867-b34a-4205-83dc-36c889e0f0e4/wewazoraxadanosurupopojub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8994c5c5-f0e1-40f2-9902-8376ad2f3230/gunalumotovovizir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c414e012-c1ed-4a87-9ad4-3328b79a2ff2/administracion_de_medicamentos_por_via_rectal_objetivos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b676f0c1-f9fb-48ca-bc4d-1f1c8f9dc57b/13728548325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11b82da-45fb-427e-8681-359855d5fc5c/zebra_qln320_hard_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/815bc397-ec49-4bc4-adae-ee8f6b0fb587/travel_itinerary_template_word_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98519775-76ce-463a-a84d-7d253720fc27/how_to_calculate_the_total_interior_angles_of_a_polygon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b4f1922-c613-48f4-bc72-cfe15c38558b/64034629963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b97532d7-89a6-4d03-8d60-9ffa642adbde/the_ways_of_white_folks_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006dd1e8-69ba-462c-8832-0a93cc3d9926/how_can_i_convert_my_mini_dv_to_dvd.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_off0000e89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89D 5164 bytes
SHA-256: 8bd8792513e9ca1b80418071636a7c06235f8f8726e20b8afaa8adc41358b69f
font_01_sfnt_off0000fa58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA58 11232 bytes
SHA-256: bd7062011f5ad8cccd48820ac420e8f54acf97f9149516537e723e61e97531bd

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