Malicious PDF — malware analysis report

Static analysis result for SHA-256 a24f23bd7e0ede38…

MALICIOUS

PDF

69.4 KB Created: 2021-02-19 05:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4de59bb9866f1237ce8238c39d1ba2a0 SHA-1: e8eb0e58babdef1012b358cf30c2d2d308080e0a SHA-256: a24f23bd7e0ede3885aa5a7ebddfe1e430abd4cc0275c2f206d1f00a80642d91
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jottigo.ru', which is likely used to host a malicious payload or phishing page. The document body, though heavily obfuscated, appears to contain metadata related to statistics and PDF generation, suggesting a lure to disguise the malicious intent.

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
  • 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://jottigo.ru/strik?utm_term=bluman+elementary+statistics+a+step+by+step+approach+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4486778/normal_5feb7cb8bb42d.pdfIn PDF document text
    • https://cdn.sqhk.co/velabolo/ibihdgj/luselinozixawe.pdfIn PDF document text
    • http://kopumiwabetare.66ghz.com/pantone_cmyk_color_guide_coated_uncoated.pdfIn PDF document text
    • http://wowuzarupi.iblogger.org/vunobokosegopunabopije.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500208/normal_5fcebb977adb6.pdfIn PDF document text
    • http://gijipodotetojo.22web.org/15868214815.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501503/normal_600c3d4f93136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_600fc809e94f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404983/normal_5fd7f60fa0fbd.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/petuzutemixuvod/miduramomifapiwuko.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/sign_language_alphabet.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/diary_of_a_wimpy_kid_the_meltdown_epub_free.pdfIn PDF document text
    • http://pamiwumewamem.epizy.com/what_happened_to_the_little_mermaids_mother.pdfIn PDF document text
    • http://pimorem.epizy.com/adenocarcinoma_in_situ_cervix_patient_information.pdfIn PDF document text
    • http://likijanima.epizy.com/12654856220.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/written_security_incident_report_example.pdfIn PDF document text
    • http://fufifaramulemi.rf.gd/work_permit_form_md.pdfIn PDF document text
    • http://sirovak.rf.gd/zekole.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_off0000d07e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07E 5688 bytes
SHA-256: 22b3175d0d4ea4996266eafbbceff1accdd1673c4067f58921ffaca37707aff4
font_01_sfnt_off0000e3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AC 10836 bytes
SHA-256: bb87c353de6fbce11a27acc2341e53e07543dd6c236fe26636df617f6f178ba3

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