Malicious PDF — malware analysis report

Static analysis result for SHA-256 729091b34938ffcc…

MALICIOUS

PDF

102.8 KB Created: 2021-04-12 00:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 837c35cbb927d6bb6855d946bc6afe8e SHA-1: fc7c5899a46a749831654e62e5e1c789a3f78c1c SHA-256: 729091b34938ffcc24f7a62af99d829883799ebc91201b3bfd6dc0c78b0850a7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to malicious content or exploit kits. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/strik?utm_term=what+were+the+names+of+the+fallen+angels PDF link annotation
    • http://phtech.site/how_many_calories_to_lose_weight_chartgtktx.pdfIn PDF document text
    • http://invitesistem.ru/912766335780lzy9.pdfIn PDF document text
    • http://maxafutolo.iblogger.org/bodybuilding_anatomy_nick_evans.pdfIn PDF document text
    • http://megantv.site/how_do_i_access_my_wd_cloud_dashboard96cp1.pdfIn PDF document text
    • https://cdn.sqhk.co/pikikunifav/jhjeFSt/pdf_pathophysiology_of_pneumonia.pdfIn PDF document text
    • http://samettemiz.xyz/adobe_package_price_for_macv7uei.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/hiy3X3w/48566167470.pdfIn PDF document text
    • http://worldworkbook.com/796613476967wg1j.pdfIn PDF document text
    • http://sesugato.iblogger.org/rectus_abdominis_exercises.pdfIn PDF document text
    • http://filaminipanugin.iblogger.org/shorter_encyclopaedia_of_islam.pdfIn PDF document text
    • https://cdn.sqhk.co/mojuzizimu/ibNiavG/space_invaders_alien_art.pdfIn PDF document text
    • https://cdn.sqhk.co/vimanagadu/YsYDV8K/22564579439.pdfIn PDF document text
    • http://123dutch.com/55318906781rj6ou.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/jcCgeid/78893048306.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://vavazewesepato.epizy.com/anatomia_y_fisiologia_del_intestino_delgado.pdfIn PDF document text
    • http://noluxum.epizy.com/tanipowume.pdfIn PDF document text
    • http://kisuneronebel.rf.gd/ib_visual_arts_comparative_study_sample.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_off000147d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D9 5028 bytes
SHA-256: 36563f81f437e8da8151b251ef2976d507051a1f9be40ca7bd6a7843a41c117d
font_01_sfnt_off000158d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D8 11488 bytes
SHA-256: 20cf91299260eb4017dbaaa8ca08d54aad8ac8a1f3f8cdaae4dc3425a4e0b98a
font_02_sfnt_off00017fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FD8 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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