Malicious PDF — malware analysis report

Static analysis result for SHA-256 30f0558bc3002fd0…

MALICIOUS

PDF

70.7 KB Created: 2021-02-26 08:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b34d9652a0b4bd08581ca00cb6e37bef SHA-1: 905c90e6b3414d0bf439c04e6bac900b8e57aa75 SHA-256: 30f0558bc3002fd0b61805b20df436e5bfecbf0aba685cf7a079a7d2ad1fa50d
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains text related to 'simple present negative exercises' which is likely a deceptive pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=simple+present+negative+exercises PDF link annotation
    • http://marinarus.space/rivorubebizxufjf.pdfIn PDF document text
    • http://dorightunion.com/arrondir_dans_une_formule_excellsmx1.pdfIn PDF document text
    • http://gtmedis.com/chemdraw_software_for_mac_freewzl4h.pdfIn PDF document text
    • https://cdn.sqhk.co/miwurazaz/tK48jjl/drag_bike_racing_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/jjgieHS/joxapekavavege.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386366/normal_600ab5a5eaaa2.pdfIn PDF document text
    • http://mjawebdesign.net/vomipomikorijowelobosazekyv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5fe929ac46e53.pdfIn PDF document text
    • http://organize.shop/directv_remote_control_code_for_tcl_tvd7gvy.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/bPqpblI/advert_success_criteria_ks2.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/covid_19_testing_in_my_area_free.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/kikunojulejuj/kpi_scorecard_template_powerpoint.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 5484 bytes
SHA-256: 10caf3d1721a473fee8cd2d6953433e01e9218d06eb9ed2170c551514d8f9d05
font_01_sfnt_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 9188 bytes
SHA-256: c0f12519fc8fe1d130210790da3c10306034c108e10816004a4190e5a19fa313

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