Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1c7235e4110289…

MALICIOUS

PDF

76.8 KB Created: 2021-02-02 13:24:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 745289365de28bdffd3981ce0645a493 SHA-1: a059f79a4f56127a6d76b934e651f5c49b5eb9f0 SHA-256: 5f1c7235e4110289f57c69042ce4c785b5a585891504b912e0c8c24077a8dc5b
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirectors or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to tuition and application, suggesting a lure to trick users into clicking the malicious links.

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
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=university+of+st+thomas+tuition+2018 In PDF document text
    • http://girlita.space/lufigogixebadapgfqzw.pdfIn PDF document text
    • http://vigastlens.xyz/gerek_tp_karacier_temizlii58n6b.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/butoxid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485705/normal_5fd0f598d86fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485578/normal_6005cf148fbbc.pdfIn PDF document text
    • http://ccckkkkk.space/vixutubejlmef5.pdfIn PDF document text
    • http://lazerepil.site/boxoverekoridowojupukisdwx3.pdfIn PDF document text
    • http://mscgis.net/pivurlz7cn.pdfIn PDF document text
    • http://matrixbicycles.com/drone_shadow_strike_apku98ho.pdfIn PDF document text
    • http://rikororasikenek.iblogger.org/gotaribufowazemaxadawit.pdfIn PDF document text
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/koxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_600a1fc5aba64.pdfIn PDF document text
    • http://madewithsunshine.com/terumusexuwefupodavebatu0uv1.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/gowebabuxogiro/powerpoint_template_for_mathematics_free.pdfIn PDF document text
    • http://gegepemu.rf.gd/sample_of_appreciation_certificate_for_good_performance.pdfIn PDF document text
    • http://didaduxazej.epizy.com/tabivunoza.pdfIn PDF document text
    • http://rajokawaxes.rf.gd/xsplit_gamecaster_premium.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/54403232509.pdfIn PDF document text
    • http://banobozibijur.epizy.com/patofisiologi_amoebiasis.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_off0000ec16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC16 5648 bytes
SHA-256: 9bd99d303382706fd1d0c1a98978d01f21ab90438e5d42add7da49802597d0e4
font_01_sfnt_off0000ff2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2F 11872 bytes
SHA-256: 38d20cc1c8faed451cc2bc68db24ab4ac9c30dc965101c3cdd213d0d18ae390b

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