Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8044d326726ce4…

MALICIOUS

PDF

74.7 KB Created: 2021-03-23 16:34:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3e04f9fc59e8f0b3f45fb7abc047939e SHA-1: 914ec4d40cd0d3e9a3cb989ba019995ce40f765a SHA-256: 4a8044d326726ce4ab8b854a31a6658de325b9d0bdf8fe1776be0234e4122f33
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a ClamAV signature and an ML classifier. It contains an embedded URI pointing to 'https://botokaw.ru/strik?utm_term=d%2527link+dcs-930+lb', which is highly suspicious. The document body is heavily obfuscated, but the presence of the external URI strongly suggests a phishing or malware distribution attempt.

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://botokaw.ru/strik?utm_term=d%2527link+dcs-930+lb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4406223/normal_5fd85b5ae285e.pdfIn PDF document text
    • http://surisetufuna.iblogger.org/john_dewey_high_school_email_address.pdfIn PDF document text
    • http://supernefritroller.xyz/diarios_de_motocicleta_script_en_espaolqqfbt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5fdf4a4757929.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420745/normal_5ff309fe61745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375358/normal_60546770a7a4d.pdfIn PDF document text
    • http://tovelksa.website/99951169547muk9t.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/zidosozawok/lewivuref.pdfIn PDF document text
    • http://motojanafit.epizy.com/download_berlitz_english_course.pdfIn PDF document text
    • http://negekipewunej.epizy.com/53542180613.pdfIn PDF document text
    • https://s3.amazonaws.com/girilifawuxi/windows_defender_update_for_win_10.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/1535943054.pdfIn PDF document text
    • http://jutesokom.rf.gd/pamagixovareveretusugil.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/30771330144.pdfIn PDF document text
    • http://fasujenijasezos.rf.gd/81349686277.pdfIn PDF document text
    • http://tuzawuza.epizy.com/jikajabejodonar.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_off0000e50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 5356 bytes
SHA-256: 6c51334499b2c58fd5e08b9faa1f47408a6401b048616354c802597f292209b8
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 11076 bytes
SHA-256: b11d39e7e561652361eb1be08a4876272f76848f869a1671988cbcd279fb38f0

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