Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc82e6c49d95d15…

MALICIOUS

PDF

71.5 KB Created: 2021-04-03 23:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cebc94a58ce7bd7dcc9c925a6c91d563 SHA-1: c9ffbf4b07f8e8085bd67f81cfc9b36fda3acbfa SHA-256: fcc82e6c49d95d15b191e53944cced62177b383bbddba0a79a82a2e5baa07d4a
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=atomic+structure+worksheet+answers+8th+grade PDF link annotation
    • http://zunololanuxigu.sportsontheweb.net/zuwevarogemus.pdfIn PDF document text
    • http://wordsidepost.top/fenosebowegeg76do3.pdfIn PDF document text
    • http://axacheat4.xyz/besaridego6i13v.pdfIn PDF document text
    • http://vivekawiga.sportsontheweb.net/jimini.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_6035524822d63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419630/normal_60527e4ac1ec0.pdfIn PDF document text
    • http://musc-media.xyz/484595652861sbh9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448548/normal_6047da6b59fab.pdfIn PDF document text
    • http://momentshop.website/rajasthan_3rd_grade_teacher_salary_after_probationfve2r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_6066362d32606.pdfIn PDF document text
    • http://bonboxstudio.com/diablo_3_necromancer_leveling_build_xbox_onedt8gp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493201/normal_60034836c8e90.pdfIn PDF document text
    • http://reggis.info/wotupevalosevumidiltjohy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450240/normal_60004983415da.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
    • https://s3.amazonaws.com/gekixadonuru/zizijewumesato.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/kuropozodigofukokolenetu.pdfIn PDF document text
    • https://s3.amazonaws.com/tesasubawalozan/latest_whatsapp_for_blackberry_10.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/rikki_tikki_tavi_character_chart_answers.pdfIn PDF document text
    • http://guseboses.atwebpages.com/discrete_fourier_analysis_wing.pdfIn PDF document text
    • http://kepewitibafef.myartsonline.com/gevuzepobitepufutaxamu.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/tratamiento_de_ascaris_lumbricoides_en_adultos.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_off0000cd7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7C 5544 bytes
SHA-256: 2a5310a658ed2946d7fff14449020294c8a3145bf066768aef8d21522b309ce7
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 10004 bytes
SHA-256: 604e12038b4cdae6e4021a61f1ebe7e924fec3009c7ef93742d09b2f55d496ed
font_02_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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