Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bb6d9755eac6b70…

MALICIOUS

PDF

70.5 KB Created: 2020-12-27 00:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8c3cb0d72d2bd26b9111b81654ea39c SHA-1: d254f5186c2bd7034b8ba167aff56635d15f52cc SHA-256: 5bb6d9755eac6b7030d745264a9c06e8f5a32528b8914b162864d08ead0ff3e2
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to contain keywords related to job searching, suggesting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/strik?utm_term=amazon+driver+jobs+twinsburg+ohio
    • https://cdn-cms.f-static.net/uploads/4404529/normal_5fb9e3493e402.pdf
    • https://cdn-cms.f-static.net/uploads/4404738/normal_5fb4273eb5834.pdf
    • https://cdn-cms.f-static.net/uploads/4459464/normal_5faaf777d7f11.pdf
    • https://cdn-cms.f-static.net/uploads/4379035/normal_5f90f2cb7ac0b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tosego/10681378064.pdf
    • https://s3.amazonaws.com/najubu/modelo_pedagogico_tradicional_caracteristicas.pdf
    • https://s3.amazonaws.com/gezetega/fikekagaka.pdf
    • https://s3.amazonaws.com/fulomufimikim/timex_marathon_wr50m_manual.pdf
    • https://s3.amazonaws.com/dudujopixejikug/vawewaku.pdf
    • https://s3.amazonaws.com/xufoxorog/bapikoworamovubifolebo.pdf
    • https://s3.amazonaws.com/warapagefasovi/how_to_hack_dragon_mania_legends_with_lucky_patcher.pdf
    • https://s3.amazonaws.com/jivagajamav/aristocats_scales_and_arpeggios.pdf
    • https://s3.amazonaws.com/lovomijelun/termination_of_employment_letter_template_ireland.pdf
    • https://s3.amazonaws.com/gifojuxaxeva/best_ps1_emulator_for_android_2019.pdf
    • https://s3.amazonaws.com/davolazupivowi/dikuv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d640.bin
6cb89fe46ebc5b7c4550e21743920f1203b97994a2e30f9b71d706d8aa0f2bdd
pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 5616 bytes
font_01_sfnt_off0000e947.bin
ef510d2d499a12327888f40c253698095cf623476e4765c0c4f2984e904a12e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE947 10332 bytes