Malicious PDF — malware analysis report

Static analysis result for SHA-256 50bd9620282dc71e…

MALICIOUS

PDF

86.6 KB Created: 2021-03-25 05:36:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d26c8287e5dd5d9beca23a240357e92d SHA-1: 861ff007916299bec19a21108a7c868de9216376 SHA-256: 50bd9620282dc71ebf3caff205b7cc3bf026ce957518497b8f369c70f7952e0c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a link farm designed to manipulate search engine results. One prominent URL, 'https://xezojetit.ru/strik?utm_term=service+engine+soon+light+flashing+nissan+altima', appears to be a lure. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. While no scripts were directly extracted, the PDF structure and link farm heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • 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.
  • 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://xezojetit.ru/strik?utm_term=service+engine+soon+light+flashing+nissan+altima PDF link annotation
    • http://mesretly.xyz/rikuwevikoxefolazotyzlod.pdfIn PDF document text
    • http://cancandance.org/limit_state_design_of_steel_structures_by_sk_duggal_free_downloadz638d.pdfIn PDF document text
    • https://cdn.sqhk.co/kilobubag/cCiilcp/70797263688.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/hcQMiem/11423813369.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/1hfhczs/pedurilulifuzowugexafa.pdfIn PDF document text
    • https://cdn.sqhk.co/nobipajami/Drecie4/f1_racing_tv_schedule_usa_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/cb7gdhi/learn_basic_chinese_language_online_free.pdfIn PDF document text
    • http://weareanonymous.org/1190362222e8kd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/60965354091.pdfIn PDF document text
    • https://7be8961d-effb-4c78-a255-78c3c9f0be09.filesusr.com/ugd/3dd68e_16af92d670454fc787db9774c6ea9f50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f580381-2f82-49b7-8358-4897d9f307c7/what_are_some_common_diagnostic_tests_for_covid.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/64273108039.pdfIn PDF document text
    • https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_ee4e9fa338a940e999d38d9b13e4b7fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/golepe/54387954572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2f17140-cede-42d3-80d3-6c305c402134/brother_mfc-7360n_printer_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f24f6058-d892-457a-a82b-9bbcbe6b2063/printable_list_of_magic_tree_house_books_in_order.pdfIn PDF document text
    • https://3a7b682b-4b85-4b21-836a-a34929c8735b.filesusr.com/ugd/0cd3a8_ceadfbddd64344d8b4e371b3cae38fba.pdf?index=trueIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_0c15aea6ebd140e1a5447bb63e1b93cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/gurisenafinu.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/peer_gynt_suite_movement_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a55f2c7-5279-4e81-82f7-c997d043180f/dell_km632_wireless_keyboard_how_to_connect.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_79ef28a248364fb1b451d806e4f2f11a.pdf?index=trueIn PDF document text
    • https://4f0754e2-f0c4-47db-826b-83042027646c.filesusr.com/ugd/7a11b0_411f305844694caebb676ce27fa4387c.pdf?index=trueIn 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_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 5460 bytes
SHA-256: f0ebd6398aa3b5f91508ad27775f55dbf4f91b268a61b3201d56ebde564e60df
font_01_sfnt_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 12184 bytes
SHA-256: eed9e0fa6d21ae22368f9725b4ddb310b4e24b1dadbf57cc16516e959074690a

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