Malicious PDF — malware analysis report

Static analysis result for SHA-256 777cdf86ecd786dc…

MALICIOUS

PDF

77.5 KB Created: 2021-03-04 10:37:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 84c505c4a5e34a8dede6a17f2a3c30b5 SHA-1: c1235aa41346807abddc58981f6a2531571dcddf SHA-256: 777cdf86ecd786dc7ef470026cab278e31435f5697fa1b73d232cefa60c4f8ac
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 link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://dugedepap.ru/award?keyword=how+to+troubleshoot+canon+printer+errors PDF link annotation
    • http://dejevixumuvele.22web.org/universidad_del_tolima_sede_bogota_precios.pdfIn PDF document text
    • https://cdn.sqhk.co/nogegamapagi/chfihSU/nuts_and_bolts_organizer.pdfIn PDF document text
    • http://pugorot.mygamesonline.org/keritoxirenimamofetavef.pdfIn PDF document text
    • http://pemizirevubel.mywebcommunity.org/sukoronawomoguzimulav.pdfIn PDF document text
    • http://setifol.66ghz.com/32030575645.pdfIn PDF document text
    • http://kazexezawulozij.mypressonline.com/83082326161.pdfIn PDF document text
    • http://wodasewusinoda.22web.org/wezitoderevafenelen.pdfIn PDF document text
    • http://nesakud.mypressonline.com/vobemodeju.pdfIn PDF document text
    • http://fukijuwevo.getenjoyment.net/how_to_write_a_critical_review_of_a_research_paper.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/how_to_turn_off_air_suspension_on_jeep_grand_cherokee.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/does_warrior_diet_work.pdfIn PDF document text
    • http://fawikenaxalu.scienceontheweb.net/contax_g1_user_manual.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://jisijuvod.myartsonline.com/entry_level_mechanical_engineering_jobs_colorado_springs.pdfIn PDF document text
    • http://jiwositefikeb.rf.gd/10154024405.pdfIn PDF document text
    • http://pedirite.onlinewebshop.net/zuxefi.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/angular_templateurl_and_template.pdfIn PDF document text
    • http://vexabimumemig.atwebpages.com/star_wars_quiz_questions_printable.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 5096 bytes
SHA-256: 5f0e7c371ef5d79a63e88cb480ad0972093d8baf6c2365fba9ef2636622083a9
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10428 bytes
SHA-256: 40eb590f935a4769bcd7089e96afe47bc295bc0b0ebc9f6294c91e037df6d002
font_02_sfnt_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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