Malicious PDF — malware analysis report

Static analysis result for SHA-256 c09881378f008297…

MALICIOUS

PDF

71.6 KB Created: 2021-04-25 01:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d6a891d75079b533362c549cbb9977f SHA-1: 29ac56b22d0946d81748f90db42e96cdd030a02e SHA-256: c09881378f008297d1686614be2923e04f72346ba2e631cefd08fc98593d6138
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF contains a large number of external links, a technique often used for SEO spam or to redirect users to phishing or malware sites. While no scripts were explicitly extracted, the presence of numerous external URIs suggests an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://seumenha.ru/strik?utm_term=castle+on+a+cloud+les+mis
    • http://zuluguvo.iblogger.org/dave_ramsey_budget_spreadsheet.pdf
    • http://fullstacket.online/falling_in_reverse_lead_singer_deadruyn6.pdf
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/woxaxixegud.pdf
    • http://zekabor.iblogger.org/kenya_school_calendar_2019.pdf
    • http://kersita.space/5166541738285ovm.pdf
    • http://zesamoa.online/butesusyhyi.pdf
    • https://dusonibegoxat.weebly.com/uploads/1/3/1/3/131380688/6914438.pdf
    • http://funanomofov.22web.org/westminster_dictionary_of_theological_terms.pdf
    • http://vinograd.io/ashton_irwin_superbloomjlv3k.pdf
    • http://sandiego-podcasts.com/cancer_pulmonar_de_celulas_no_pequeasuqyzx.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/1225659b-1ca4-4e2e-8d89-92dcac12da4c/12409163191.pdf
    • https://uploads.strikinglycdn.com/files/6e3e98d3-36b9-4afb-9d18-c0ed1948d592/lotoga.pdf
    • https://uploads.strikinglycdn.com/files/a8987eaf-a0b6-44c4-9e29-3e75c27ad882/gamitimi.pdf
    • https://uploads.strikinglycdn.com/files/4e66fa66-e6c1-40ea-8d58-ece70bfcbf8c/fluke_ms2-ttk_microscanner2_termination_test_kit.pdf
    • http://xegukamadoso.epizy.com/59111667223.pdf
    • http://lonuzokubezuva.epizy.com/83504729008.pdf
    • https://uploads.strikinglycdn.com/files/9d9fb66a-7674-49c7-91ab-e6c04118ab19/nextbook_ares_8_tablet.pdf
    • https://uploads.strikinglycdn.com/files/fc2f0c43-b7c7-414b-bf7f-6625e5fbc1de/masimo_rad_8.pdf
    • https://uploads.strikinglycdn.com/files/82977a36-ff25-4503-bdef-91e846e36910/87860686904.pdf
    • https://uploads.strikinglycdn.com/files/161a7550-68d9-4229-b568-1bccfbe15501/how_to_program_chamberlain_remote_to_genie_opener.pdf
    • https://uploads.strikinglycdn.com/files/fad77719-a5b9-4206-93ac-112ec481f843/66602333191.pdf
    • https://uploads.strikinglycdn.com/files/c603e55e-c32d-4921-95ba-a48b7312850c/how_do_you_say_thank_you_in_chinese_phonetically.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89a.bin
c96b0451489d1fbe50412ab33d392756dafeb059f54dd85155f4c770c098fdb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 4892 bytes
font_01_sfnt_off0000e926.bin
c67b7bf3fff4db12f180079ebd45dbfedfd164637fc3fee6b0377ec66c5ed40d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE926 12104 bytes

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