Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e9e6f9405ca7c66…

MALICIOUS

PDF

72.5 KB Created: 2021-02-24 08:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c7d258fa2892ff319d836ba331f5657f SHA-1: 2251016588765ba9251642c48c6b3ca29a4957ec SHA-256: 4e9e6f9405ca7c666f663fdc88d00e28b65fa2fc5d776d218a66496f7b026903
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains multiple embedded URLs, with the primary one being `https://jottigo.ru/wix?keyword=electrostatic+worksheet+answer+key`. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=electrostatic+worksheet+answer+key PDF link annotation
    • https://cdn.sqhk.co/pimibopugugo/ZXiaPic/92109814872.pdfIn PDF document text
    • http://nasaxupinile.iblogger.org/ekko_guide_build.pdfIn PDF document text
    • http://pixubak.iblogger.org/factoring_polynomials_with_synthetic_division_worksheet.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/42367174308cldsb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485448/normal_603037d001738.pdfIn PDF document text
    • http://netarowivon.iblogger.org/acid_chloride_to_ester_pyridine.pdfIn PDF document text
    • http://erogancolumbia.site/xeputapivpjaov.pdfIn PDF document text
    • http://nukels.xyz/47877021018zy754.pdfIn PDF document text
    • http://infonewstravel.com/67748737826ifetw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_601a3dee7bb4c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vupikefugogulup.epizy.com/takeuchi_tl8_manual_regeneration.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/whatsapp_app_new_version_2018_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/85662837336.pdfIn PDF document text
    • http://latilofu.rf.gd/idaho_state_police_report_request.pdfIn PDF document text
    • http://situbepid.epizy.com/resumen_del_capitulo_4_de_batallas_en_el_desierto.pdfIn PDF document text
    • http://vebojikabugoxa.rf.gd/cpc_exam_prep_study_guide.pdfIn PDF document text
    • http://guxasimedoki.epizy.com/xflow_cfd_software.pdfIn PDF document text
    • http://dozonexupiwef.epizy.com/21157175180.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_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 5100 bytes
SHA-256: d050de94535e3f13346996cd829e25f4f6dd22d7e43598074bb95d3424d4769a
font_01_sfnt_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 10240 bytes
SHA-256: e4957a1864a99d56cf02201f3a3a0194c7eaa8f26e57a4903e3440b6db0237dd

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