Malicious PDF — malware analysis report

Static analysis result for SHA-256 eca4b4e19a84d186…

MALICIOUS

PDF

68.2 KB Created: 2021-03-08 18:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a50e4d77ba3b69ff845b9cc3af2a7c3 SHA-1: 29c82b7c8cfca6766a3a6d329d0f1fdf27334cf5 SHA-256: eca4b4e19a84d1862791cafa32ede9dd637ee2ec97d30166472c113ca8ae9b4a
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'jumiwimov.ru', which is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the structure suggests exploitation of PDF vulnerabilities to redirect users.

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-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://jumiwimov.ru/wix?keyword=bokser+alexander+m.+dds
    • https://cdn-cms.f-static.net/uploads/4485434/normal_6014be45e7d59.pdf
    • http://marudibiwel.iblogger.org/chest_x_ray_report.pdf
    • https://cdn-cms.f-static.net/uploads/4371261/normal_6014c3bb2c6c2.pdf
    • https://static.s123-cdn-static.com/uploads/4457011/normal_5fc6c61ec65dd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vipinib/star_method_of_answering_behavioural_questions.pdf
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_e98ab7f98b1345cba70de260b6b690fd.pdf?index=true
    • https://s3.amazonaws.com/miwolezedubujoz/zazujoxaviwe.pdf
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_d4f78b76a03b401191d6ad8000bdb045.pdf?index=true
    • https://aa5f33e9-793b-4807-a257-9eac84d314d0.filesusr.com/ugd/aa57b2_e87d50d4f0af4228a5c909b88c8fbb9d.pdf?index=true
    • https://s3.amazonaws.com/kagedatabujo/how_to_find_theoretical_concentration.pdf
    • https://s3.amazonaws.com/miwolezedubujoz/48847031066.pdf
    • https://s3.amazonaws.com/pajukovuxetu/rukadamigenu.pdf
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_e45bc2d76a7745cca2e5df6b2a504551.pdf?index=true
    • https://s3.amazonaws.com/sonutopexaramuf/the_vampire_diaries_logo_svg.pdf
    • https://s3.amazonaws.com/tigovatolis/vakratundaya_song_free.pdf
    • https://s3.amazonaws.com/dobikasukavu/tajizisizugun.pdf
    • https://s3.amazonaws.com/tedowafomaru/libexado.pdf
    • https://s3.amazonaws.com/lodazojamuva/vocales_para_colorear.pdf
    • https://s3.amazonaws.com/jofunozuzof/action_points_list_template.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/84674842110.pdf
    • http://wofukisunoxo.epizy.com/linux_essentials_midterm_exam_answers.pdf
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_3f591ad531cb40199fe17c9f319e1348.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfd2.bin
f198908e6a0fc96574c8771020660d62c673ebe5dcbaa437dcdc1ca6e362e28b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 5184 bytes
font_01_sfnt_off0000e162.bin
fc090291904cd2cc9ee52f8d609aae166ccc29037169ae4b4f4b8368261b1f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE162 10012 bytes

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