Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c5bb81fda0d76de…

MALICIOUS

PDF

72.1 KB Created: 2021-02-23 12:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ac2a1a1e5a233a8da99f317df1eff4d3 SHA-1: 790ecad02737749ceb8a36c947c9a7817d128e68 SHA-256: 6c5bb81fda0d76de2725e0cae306f1636bbf9724f500c146bc6204d13d7eaed4
96 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV, specifically identified as a phishing trojan. The embedded URL points to a suspicious domain, suggesting it is used to host or redirect to malicious content. The document body, though heavily obfuscated, contains text related to 'introduction to machine learning with python book pdf', likely a lure to entice users to interact with the malicious content.

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://jacksth.ru/123?utm_term=introduction+to+machine+learning+with+python+book+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459163/normal_5fff71f852643.pdfIn PDF document text
    • https://cdn.sqhk.co/moxawitab/JgdfJ8C/soxasetaxepofiruwepugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_602ae15e84903.pdfIn PDF document text
    • http://jigatinapa.22web.org/tamil_movies_hd_print.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_6004908165cde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490936/normal_5fd177062d6f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382620/normal_60249736b7200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491169/normal_5feb6f37ee9d1.pdfIn PDF document text
    • https://cdn.sqhk.co/gebunemif/npRgoge/falling_waters_trail_nh_weather.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/samilofa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369327/normal_5fff474637c3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418367/normal_60284325c0262.pdfIn PDF document text
    • http://rowokalasi.iblogger.org/comment_couper_un_fichier_en_deux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledojiwibobuva.rf.gd/bukojuzutewakij.pdfIn PDF document text
    • http://xegiseko.epizy.com/zukeg.pdfIn PDF document text
    • http://xozelabudizi.epizy.com/87123193660.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_off0000dbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCF 5728 bytes
SHA-256: a1352d45b361cceca3c76709c628183a0b88fb9c02688cde1f96a815cb9c643e
font_01_sfnt_off0000ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3B 10724 bytes
SHA-256: 11c9feac64cf9ec7d7efbbe118a02df795d5bd09dcc696aa644374e341a91484

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