Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f92660e18933cac…

MALICIOUS

PDF

83.3 KB Created: 2021-02-18 01:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 412b6d38a95745fbb1ae38d3acd40f63 SHA-1: fddcb051176a0666ad1299b309b4522959fe2766 SHA-256: 5f92660e18933cace44839acef4e0db21283ac1181bf08561ce896809f9e6db4
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 'jottigo.ru', which is likely part of the phishing lure. The document body, though heavily obfuscated, contains text fragments related to 'abstract algebra' and 'wkhtmltopdf', suggesting a social engineering pretext to drive users to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/123?utm_term=how+to+study+abstract+algebra PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410985/normal_5ff1b0639091b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_601f9ede78729.pdfIn PDF document text
    • http://tipopajokoti.iblogger.org/miweturulijap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5ffddae2f1d4a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419424/normal_5fcbbf15c231c.pdfIn PDF document text
    • http://my-favshopd.online/metodo_inductivo_deductivo_analitico_y_sinteticodm4bk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450139/normal_600dfde429ff0.pdfIn PDF document text
    • http://tehnotop.space/rimojazejaripe88spk.pdfIn PDF document text
    • http://rutevelafi.iblogger.org/dental_light_cure_unit_price_in_india.pdfIn PDF document text
    • http://myyshooop227.site/mobozesebrbxqs.pdfIn PDF document text
    • http://lobarularexe.iblogger.org/adobe_after_effects_cs4_templates_free_projects.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_601095b21029e.pdfIn PDF document text
    • http://italywom.space/131421682812ae1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_602521009977c.pdfIn PDF document text
    • http://madewithsunshine.com/648409943638d68p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413239/normal_5ff0be973ef63.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
    • http://volafipodu.rf.gd/23120125141.pdfIn PDF document text
    • http://getetir.epizy.com/t_letter_love_whatsapp_status_video.pdfIn PDF document text
    • http://waboxizolomove.rf.gd/punjabi_hd_movie_site_name.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_off0000fb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB37 5128 bytes
SHA-256: c0440776521df67b397eb0f79906a88c6faf29c6bdacbac47d724aab2ea7734d
font_01_sfnt_off00010cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC7 10788 bytes
SHA-256: f2a155b89baf933c19686f780dac1661e1d0a58685a2d355eb8dd4bf0357fb6a
font_02_sfnt_off00013168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13168 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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