Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eca78c5f4fb10a3…

MALICIOUS

PDF

80.4 KB Created: 2021-02-27 14:44:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bce42fa52e53000782d6106f9d826564 SHA-1: 63a89854dc005ccfdf88271aac521906ac4a63cb SHA-256: 4eca78c5f4fb10a3928b310d477087cb6e756bb7dda252430e2e0a9f556c5da6
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector URL, which is a strong indicator of phishing or malware distribution. The ML classifier and ClamAV detection further support the malicious nature of the file. Although the document body is heavily obfuscated, the presence of the malicious URL is the primary driver for this assessment.

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://yafferge.ru/wb?keyword=the%20water%20knife%20chapter%201%20summary In PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5fe7b4ae3fb5a.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/ghanXhg/jungle_adventures_florida.pdfIn PDF document text
    • https://cdn.sqhk.co/tedisebufen/68LQJgi/standoff_2_hack_download_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/mowanideju/cTWjfGl/fomokawekamapitimapaju.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/under_the_dome_book.pdfIn PDF document text
    • https://cdn.sqhk.co/zojoguxuban/jgpbQja/simple_literacy_activities_for_preschoolers.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/solilonisodozomijon.pdfIn PDF document text
    • https://cdn.sqhk.co/dobexesi/HicTTgj/antiphone_anonymous_sms_app_download.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/zulolefuzetofiberedite.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/idIib7d/best_free_stuff_apps_for_android_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/draw._io_uml_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/dokofeput.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/biglietti_da_visita_fai_da_te.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/merigegenaxebikusule.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/mazenuvudoxopug.pdfIn PDF document text
    • http://rujidafedisezu.atwebpages.com/how_to_turn_a_into_a_jpeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/marigold_english_book_class_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/lijib.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/jimosanefo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 5256 bytes
SHA-256: 7891a4019493b2ef08ba0585ad6eac71d0f1f7fbec377eb586599d0d45adc745
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10780 bytes
SHA-256: 8bc2bd305d1cc26f054f8b84720afe6c62b94d3bde5a8aab9cc19e064bde007e
font_02_sfnt_off000125d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125D9 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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